Televes MTD 120 User Manual

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TV & SAT Level Meter User´s manual

MTD 120

Ref. 4202

(Color)

Ref. 4207 (B/N)--

(Bit Error Rate)

BER

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TV & SAT Level Meter MTD 120 User Manual

INDEX ................................................................................................................................. Page

1.- GENERAL .............................................................................................................................................. 105

1.1.- Description ..................................................................................................................................... 105

1.2.- Speciﬁcations ................................................................................................................................. 106

2.- SAFETY RULES ..................................................................................................................................... 110

3.- INSTALLATION ....................................................................................................................................... 111

3.1.- Power Supply ................................................................................................................................ 111

3.1.1.- Operation using the External DC Adapter ............................................................................ 111

3.1.2.- Operation using Batteries ..................................................................................................... 111

3.1.2.1.- Battery Charging .......................................................................................................... 111

3.2.- Installation and Start-up ................................................................................................................. 111

4.- OPERATING INSTRUCTIONS .............................................................................................................. 112

4.1.- Description of the Controls and Elements ..................................................................................... 112

4.2.- Adjustment of Volume and Monitor Parameters ........................................................................... 116

4.3.- Selecting the Operation Mode: TV / Spectrum Analyser ............................................................... 116

4.4.- RF Band Selection: 5-862 MHz / 920-2150 MHz .......................................................................... 116

4.5.- Channel Tuning / Frequency Tuning ............................................................................................. 116

4.6.- Automatic Transmission Search .................................................................................................... 116

4.7.- Selecting Analogue / Digital Mode ................................................................................................. 116

4.8.- External Units Power Supply (EXT. SUPPLY) .............................................................................. 117

4.9.- TV Operating Mode ....................................................................................................................... 118

4.9.1.- Selecting the Measurement Mode (MEASURE) .................................................................. 118

4.9.1.1.- Measuring the Video Carrier Level (Level) .................................................................. 119

4.9.1.1.1.- On-screen Measurement Information ................................................................. 119

4.9.1.1.2.- Selecting TV Mode: TV, LV, SY (TV MODE) ...................................................... 119

4.9.1.2.- Measuring the Video / Audio Ratio (V/A) ..................................................................... 120

4.9.1.3.- Measuring the Carrier / Noise Ratio (C/N) ................................................................... 121

4.9.1.4.- Measuring the Power of Digital Channels (Channel power) ........................................ 122

4.9.2.- TV Mode Functions Menu .................................................................................................... 123

4.9.2.1.- Selection of the RF Band: (Band switching) ................................................................ 123

4.9.2.2.- Selection of the TV System and Standard (System & Standard) ................................ 123

4.9.2.3.- Batteries and External Units Power Supply (Battery & Lnb) ........................................ 124

4.9.2.4.- Data Logger Function .................................................................................................. 124

4.9.2.4.1.- Conﬁguring the Data Logger Function ................................................................ 125

4.9.2.4.2.- Selecting the Measurements to be Taken .......................................................... 127

4.9.2.4.3.- Taking Measurements ......................................................................................... 127

4.9.2.4.4.- Exiting the Data Logger Function ........................................................................ 127

4.9.2.4.5.- Examples of Data Logger Function Applications ................................................ 127

4.9.2.5.- Clock ............................................................................................................................ 128

4.9.2.6.- Input Video ................................................................................................................... 128

4.9.2.7.- Selecting the Channels Table (Channel set) ............................................................... 128

4.9.2.8.- Measurement Units ...................................................................................................... 128

4.9.2.9.- Power Off Mode (Manual power) ................................................................................. 128

4.9.2.10.- C/N setup ................................................................................................................... 129

4.9.2.11.- Channel Bandwidth (Channel BW) ............................................................................ 129

4.9.2.12.- LNB Local Oscillator Frequency (Lnb local osc) ........................................................ 129

4.9.2.13.- Video Polarity ............................................................................................................. 129

4.9.2.14.- NICAM Channel ......................................................................................................... 129

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4.9.2.15.- Search Level .............................................................................................................. 129

4.9.2.16.- Teletext ...................................................................................................................... 129

4.9.2.17.- DiSEqC Command Generator ................................................................................... 130

4.9.2.18.- Beep ........................................................................................................................... 131

4.9.2.19.- Equipment Information ............................................................................................... 131

4.9.2.20.- Exit ............................................................................................................................. 131

4.10.- Spectrum Analyser Operating Mode ........................................................................................... 132

4.10.1.- Spectrum Analyser Mode Functions Menu ........................................................................ 132

4.10.1.1.- Band Switching ........................................................................................................... 133

4.10.1.2.- Span ........................................................................................................................... 133

4.10.1.3.- Reference Level ......................................................................................................... 133

4.10.1.4.- Dual Marker/Single Marker ........................................................................................ 133

4.10.1.5.- Sweep ........................................................................................................................ 133

4.10.1.6.- Reference Noise ........................................................................................................ 134

4.10.1.7.- Channel Bandwidth .................................................................................................... 134

4.10.1.8.- Marker ........................................................................................................................ 134

4.10.1.9.- Carrier ........................................................................................................................ 134

4.10.1.10.- Bandwidth of the Spectrum Measuring Filter (Measure bandwidth) ........................ 134

4.10.1.11.- Selecting the Channels Table (Channel set) ........................................................... 134

4.10.1.12.- Batteries and External Units Power Supply (Battery & Lnb) .................................... 134

4.10.1.13.- Exit ........................................................................................................................... 134

4.10.2.- Selecting the Measurement Mode ...................................................................................... 135

4.10.2.1.- Measuring Carrier Levels (Level) ............................................................................... 135

4.10.2.2.- Measuring the Carrier / Noise ratio (C/N Referenced) .............................................. 135

4.10.2.3.- Measuring the Power of Digital Channels (Channel Power) ..................................... 136

4.11.- Selecting the Sound Mode (Sound) ............................................................................................ 137

4.12.- Measurement Conﬁguration Memories ....................................................................................... 138

4.12.1.- Storing a Measurement Conﬁguration (STORE) ................................................................ 138

4.12.2.- Retrieving a Conﬁguration (RECALL) ................................................................................ 138

4.13.- Direct Access to Functions ......................................................................................................... 139

4.14.- Printing Measurements and Memories ........................................................................................ 139

4.14.1.- Handshake and Control Lines ............................................................................................ 140

5.- BER MEASURES ................................................................................................................................... 141

5.1.- Description ..................................................................................................................................... 141

5.2.- BER measurement mode selection ............................................................................................... 141

5.3.- QAM modulation ............................................................................................................................ 141

5.4.- QPSK modulation .......................................................................................................................... 143

5.5.- COFDM modulation ....................................................................................................................... 145

5.6.- DVB Channels Identiﬁer ................................................................................................................ 148

6.- DESCRIPTION OF THE INPUTS AND OUTPUTS ............................................................................... 149

6.1.- RF input ......................................................................................................................................... 149

6.2.- RS-232C serial port ....................................................................................................................... 149

6.3.- Scart (DIN EN 50049) .................................................................................................................... 150

7.- MAINTENANCE ..................................................................................................................................... 151

7.1.- Considerations about the Screen .................................................................................................. 151

7.2.- Internal fuses which user cannot replace ..................................................................................... 151

7.3.- Replacing the Batteries ................................................................................................................. 151

7.4.- Cleaning Recommendations ......................................................................................................... 152

APPENDIX A: Channel-Frequency Tables .................................................................................................. 153

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1.- GENERAL

1.1.- Description

The result of uniting long experience in the design of TV signal analysers with the latest in technological progress, the MTD 120 brings

together the functions installers seek most, all in one small, light-weight, portable instrument.

The range of frequencies covered, from 5 to 862 MHz and from 920 to 2150 MHz, makes MTD 120 an excellent instrument for FM radio, terrestrial TV, cable TV (CATV, 'Community Antenna Television', where the subband tuning margin, from 5 to 45 MHz, enables the user to carry out tests on the return channel), satellite TV, MMDS microwave links, VSAT ('Very Small Aperture Terminal') systems, digital TV and intermediate frequency analysis (38.9 MHz). Furthermore, its high resolution frequency, 50 kHz, makes FM measurements much easier.

The MTD 120 includes the main TV standards: M, N, B, G, I, D, K and L, adopting, apart from the characteristic parameters of the standard, the correcting automatic system to obtain in all the cases an accurate measuring of the input signal level. It admits any TV system (PAL, SECAM and NTSC) and allows the user to work directly with digital TV signals for which it provides directly the measuring of power and carrier-to-noise ratio (C/N). Being a multistandard instrument, it can be efﬁciently used in any country of the world. Its accuracy and reliability meet the needs of the most demanding users.

A powerful microprocessor automatically handles a large part of the operations necessary to optimise the process of measurement; for example, continuous frequency synthesis, measurement correction, the appropriate selection of the attenuators and the automatic cut-off after the device has been inactive for a certain period of time.

The signal level measured is indicated numerically in absolute values and, optionally, on an analogue bar shown superimposed on the monitor image, that facilitates the detection of the maximum level. Moreover, in the LV sound mode, the loudspeaker emits a tone whose frequency depends on the level of the signal received, which is very useful when installing antennas. It is also possible to display on screen the line synchronism pulse like on an oscilloscope screen.

The Spectrum Analyser mode enables all the signals on a band to be viewed on the monitor at the same time to measure analogue channels level, C/N ratio referenced to a noise frequency deﬁned by the user and digital channels power using an integration method. The bandwidth of the measuring ﬁlter can be modiﬁed to improve frequency resolution. This is an indispensable feature, as high channel density is present on all transmission systems today. Spectrum display can be varied between full span (the entire band) and 8 MHz terrestrial or 32 MHz satellite. In addition, there are two markers in order to locate and list frequencies, to read signal level and frequency difference, and the level between both.

The selection of sound subcarrier is automatic, depending on the standard, or tunable between 4 and 9 MHz. When decoding TV sound it is possible to choose between the NARROW and WIDE ﬁlter to obtain the best carrier discrimination. It includes a NICAM decoder (with BER measurement); the possibility to commute the channel that is delivered to the loudspeaker enables the user to check the sound stereo and dual.

To enhance its convenience of use, it has 99 memories to store the different measuring conﬁgurations: name of the conﬁ guration, frequency, TV system, type of measurement, external units powering, units of measurement and sound. Moreover, the DATALOGGER function permits the acquisition and storage of up to 9801 measures (99 conﬁ gurations x 99 points of measure) that makes it much easier to test systems in which a large number of measurements have to be made, and enables further processing of all the information acquired.

Also, the level meter incorporates the teletext function, a DiSEqC command generator and permits to supply different voltages to the external unit (13 V / 15 V / 18 V / 24 V terrestrial TV, and 13 V / 15 V / 18 V / 13 V + 22 kHz / 15 V + 22 kHz / 18 V + 22 kHz satellite TV).

A SCART connector has been also included with input/output of audio/video.

The MTD 120 is powered by rechargeable batteries or connected to the mains through the supplied external DC power adapter.

It also incorporates a RS-232C interface which enables the user to connect the instrument to a PC for data recording, remote-control of the instrument and to a printer in order to print out the measurements.

SAFETY NOTES

Read the instruction manual before using the equipment, mainly " SAFETY RULES " paragraph.

The symbol on the equipment means "SEE INSTRUCTION MANUAL".

In this manual may also appear as a Caution or Warning symbol.

Warning and Caution statements may appear in this manual to avoid injury hazard

or damage to this product or other property.

(*)

DiSEqC™ is a trademark of EUTELSAT.

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1.2.- Speciﬁcations

TUNING Digital frequency synthesis. Continuous tuning from 5 to 862 MHz and from 920 to 2150 MHz Tuning modes Frequency, Channel or Memory. Channel plan conﬁgurable on demand Resolution 50 kHz Automatic search Threshold level selectable Memory 99 positions for measurement conﬁgurations

RF INPUT Frequency range

QAM signals 47 MHz to 862 MHz

QPSK signals 950 MHz to 2150 MHz

COFDM signals 470 MHz to 862 MHz Level range

QAM signals 45 dBµV to 110 dBµV

QPSK signals 44 dBµV to 99 dBµV

COFDM signals 45 dBµV to 100 dBµV Impedance 75 Ω Connector Universal, with BNC or F adapter Maximum signal 130 dBµV Maximum input voltage

DC to 100 Hz 50 V rms (powered by the power adapter)

30 V rms (not powered by the power adapter)

5 MHz to 2150 MHz 130 dBµV

LEVEL MEASUREMENT Measurement range

Terrestrial TV & FM bands 20 dBµV to 130 dBµV (10 µV to 3.16 V)

Satellite TV band 30 dBµV to 120 dBµV (31.6 µV to 1 V) Reading Auto-range, reading is displayed on an OSD window

Digital Absolute value calibrated in dBµV, dBmV or dBm

Analogue Relative value through an analogue bar on the screen Measurement bandwidth 230 kHz (Terrestrial band) • 4 MHz (Satellite band) (maximum band ripple 1 dB). Audible indicator LV audio. A tone with pitch proportional to signal strength. Accuracy

Sub-band ± 2.5 dB (50-120 dBµV, 5-45 MHz)(22ºC ± 5ºC)

Terrestrial bands ± 1.5 dB (30-120 dBµV, 48,25-861 MHz)(22ºC±5ºC)

Satellite band ±1.5 dB (40-100 dBµV, 920-2050 MHz)(22ºC ±5ºC) Overrange indication

vI , I

BER MEASUREMENT QAM signals

Measurement BER before FEC (Forward Error Correction). Number of non correctable packets received in the

measurement time.

Reading Numerical and level bar. QPSK signals

Measurement BER before Viterbi

BER after Viterbi Number of non correctable packets received in the measurement time.

Reading Numerical and level bar. COFDM signals

Measurement BER after Viterbi

CSI (Channel Status Information). Qualitative measurement about channel quality. Readout between 0 and 100%, the 0 % value corresponds to maximum quality.

Number of wrong packets received in the measurement time.

Reading Numerical and level bar.

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DCI FUNCTION DVB Channel Identiﬁer. It provides information about the channel we are making the measurement.

QAM SIGNAL PARAMETERS

Demodulation 16 / 32 / 64 / 128 / 256 QAM

Symbol rate 1000 to 7000 kbauds

Symbol Rate acquisition range ± 240 ppm

Carrier frequency offset ± 0,08 x Symbol rate

Nyquist ﬁlter roll-off(α) 0,15

Spectral inversion Selectable: On, Off

Equivalent noise degradation < 1,5 dB

QPSK SIGNAL PARAMETERS

IF bandwidth 55 MHz

Symbol rate 23000 to 30000 kbauds

4000 to 30000 kbauds for channel spacing frequency ≥ 29.5 MHz

Symbol Rate acquisition range ± 70 ppm

Carrier frequency offset ± 0,1 x Symbol rate

Nyquist ﬁlter roll-off (α) 0,35

Code rate 1/2, 2/3, 3/4, 4/5, 5/6, 6/7, 7/8, 8/9 and Auto.

Spectral inversion Selectable: On, Off and Auto except for the following values of Code Rate: 4/5, 5/6, 6/7 and 8/9.

Equivalent noise degradation < 1 dB

COFDM SIGNAL PARAMETERS

Carriers 2k / 8k (user deﬁnable)

Guard Interval 1/4, 1/8, 1/16, 1/32 (user deﬁnable)

Code Rate 1/2, 2/3, 3/4, 5/6, 7/8

Modulation QPSK, 16QAM, 64QAM

Spectral inversion On/off

Hierarchy

FEC Reed-Solomon (204,188) and Viterbi

MEASUREMENTS IN TV MODE

Terrestrial bands

Analogue channels Level, Video-Audio ratio and Carrier-Noise ratio (Auto and Referenced). Digital channels Channel power (Auto) and Carrier-Noise ratio (Auto and Referenced).

Satellite band

Analogue channels Level and Carrier-Noise ratio (Auto and Referenced) Digital channels Channel power (Auto) and Carrier-Noise ratio (Auto and Referenced).

DATA LOGGER function Automatic acquisition of up to 9801 measurements

SPECTRUM ANALYSER MODE Satellite band 30 dB µV to 120 dBµV (31.6 µV to 1 V) Terrestrial bands 20 dBµV to 130 dBµV (10 µV to 3.16 V) Measurement bandwidth

Terrestrial 230 kHz, 1 MHz selectable

Satellite 230 kHz, 4 MHz selectable Span

Terrestrial Full span (full band), 500, 200, 100, 50, 32, 16, 8 MHz selectable.

Satellite Full span (full band), 500, 200, 100, 50, 32 MHz selectable. Markers 2 with level, frequency, level difference and frequency difference indications. Measurements

Terrestrial bands

Analogue channels Level and Carrier-Noise ratio (Referenced) Digital channels Channel power (Integration method) and Carrier-Noise ratio (Referenced).

Satellite band

Analogue channels Level and Carrier-Noise rate (Referenced) Digital channels Channel power (Integration method) and Carrier-Noise ratio (Referenced).

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MONITOR DISPLAY Monitor LCD colour 4 inches (ref. 4202)

Black & White 4 1/2 inches (ref. 4207)

Colour system PAL, SECAM and NTSC TV standard M, N, B, G, I, D, K and L Synchronism and Burst Graphic representation over the picture Spectrum mode Variable span and reference level Sensibility 40 dBµV for correct synchronism Synchronism 50/60 Hz Automatic selection according to the system VIDEO SIGNAL External video input Scart (automatic) Sensibility 1 Vpp (75) positive video Video output Scart (75)

SOUND Input Scart Outputs Built in speaker, Scart Demodulation AM, FM, TV and NICAM, selectable De-emphasis 50 µs Subcarrier Digital frequency synthesis

Variable From 4 to 9 MHz, 10 kHz resolution

Fixed

Terrestrial According to the active standard: 4.50 - 5.50 - 5.80 -6.00 - 6.50 - 6.65 - 5.74 - AM - FM - LV - OFF. Satellite 6.65 - 5.80 - 6.50 - 7.02 - LV - OFF

TELETEXT Decodes at 1.5 level

RS-232C INTERFACE

EXTERNAL UNITS POWER SUPPLY Through the RF input connector Terrestrial External or 13/15/18 V Satellite External or 13/15/18 V

22 kHz signal Selectable

Voltage 0.6 V ± 0.2 V Frequency 22 kHz ±4 kHz

Maximum power 5 W

DiSEqC GENERATOR

(*)

According to DiSEqC 1.2 standard

POWER SUPPLY Internal

Batteries 2 x 6 V 3.3 Ah lead acid batteries

Autonomy > 1 hour non stop

Recharging time 12 h starting from a complete discharge External

Voltage 12 V Consumption 42 W Auto power off After 15 minutes without operating on any control. Deactivable.

OPERATING ENVIRONMENTAL CONDITIONS Altitude Up to 2000 m Temperature range From 5 to 40 º C Max. relative humidity 80 % (up to 31ºC), decreasing lineally up to 50% at 40º C.

(*)

DiSEqC™ is a trademark of EUTELSAT.

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MECHANICAL FEATURES Dimensions 280 (W) x 95 (H) x 250 (D) mm Weight 5,2 kg

INCLUDED ACCESSORIES

Rechargeable battery 6 V, 3.3 Ah

"F"/F-BNC/F adapter

"F"/F-"DIN"/F adapter

"F"/F-"F"/F adapter

External DC adapter

Carrying bag

NOTE: BER measurement options of QPSK, QAM or COFDM modulated signals vary based on the model of used Measurer.

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2.- SAFETY RULES

* Use this equipment connected only to systems with their negative of measurement connected to ground potential.

* The external DC adapter is a Class I equipment, for safety reasons plug it to a supply line with the corresponding ground terminal.

* This equipment can be used in Overvoltage Category II installations and Pollution Degree 2 environments.

* When using some of the following accessories use only the speciﬁed ones to ensure safety:

Rechargeable batteries

External DC adapter * Observe all speciﬁed ratings both of supply and measurement. * Remember that voltages higher than 60 V DC or 30 V AC rms are dangerous. * Use this instrument under the speciﬁed environmental conditions. * The user is only authorized to carry out the following maintenance operations:

Batteries replacement

On the Maintenance paragraph the proper instructions are given.

Any other change on the equipment should be carried out by qualiﬁed personnel. * When using the power adaptor, the negative of measurement is at ground potential. * Do not obstruct the ventilation system of the instrument. * Use for the signal inputs/outputs, specially when working with high levels, appropriate low radiation cables. * Follow the cleaning instructions described in the Maintenance paragraph.

* Symbols related with safety:

DIRECT CURRENT ALTERNATING CURRENT

DIRECT AND ALTERNATING GROUND TERMINAL

PROTECTIVE CONDUCTOR FRAME TERMINAL

EQUIPOTENTIALITY CAUTION (Risk of electric shock)

ON (Supply) DOUBLE INSULATION (Class II Protection)

OFF (Supply) FUSE

CAUTION REFER TO MANUAL

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3.- INSTALLATION

3.1.- Power Supply

The MTD 120 is a portable instrument powered by two 6 V - 3.3 Ah lead acid batteries. There is also an external DC adapter provided for

mains connection and battery charging.

3.1.1.- Operation using the External DC Adapter

Connect the external DC adapter to EXT. SUPPLY [38] on the MTD 120 side panel. Connect the DC adapter to the mains. Then, press

the MTD 120 on/off key [2] The level meter is now in operation and the batteries are slowly charged. When the instrument is connected to the mains, the CHARGER indicator [7] remains lit.

3.1.2.- Operation using Batteries

For the device to operate on the battery, disconnect the power cable and press the on/off key [2]. The fully charged battery can power

the equipment for more than 1 hour non-stop.

If batteries are very weak, the battery cut-off circuit will prevent the device from functioning at the same time the beeper will be heard. In

such a situation batteries must be recharged immediately.

Before taking any measurements, you have to check the charge state of the batteries by checking the battery charge level indicator

BATTERY OK [8] on the front panel, or Battery & Lnb function on the TV mode functions menu (see section '4.9.2.3 Batteries and External Units Power Supply').

The BATTERY OK [8] led indicates the battery charge state. For battery charge levels close to 100% and if the unit is powered by the

external power adapter, it remains lit. For battery levels between 100% and low battery it starts to ﬂ icker, gradually fading as the charge level decreases. On reaching Low Battery, it ceases to light up at all. When the instrument indicates a Low Battery (the led does not light up) the batteries must be charged immediately. When the low battery level is reached, the monitor momentarily displays the message VERY LOW BATTERY and the beeper sounds.

3.1.2.1.- Battery Charging

To fully charge the batteries, connect the instrument to the external DC adapter without pressing the on/off key [2]. The length of

time it takes to recharge it depends on the condition of the battery. If they are very low the recharging period is about 12 hours. The

CHARGER [7] indicator should remain lit.

IMPORTANT

If batteries are completely discharged, it is advisable to recharge them for a period of one hour before putting the instrument into

operation again. In these circumstances it is not recommended to power external units at the same time batteries are recharged.

IMPORTANT

The lead acid batteries of the instrument must be kept fully charged during periods when it is not in use. To ensure the best

results, the batteries must always be fully charged. If the equipment is in storage or is used only occasionally for a long period of time, it is ABSOLUTELY NECESSARY to check the full-charge functions periodically (every six months, for example), and to compensate for the self-discharging effect of the batteries. The rate at which a fully charged battery self-discharges depends on the temperature. For example, at an ambient temperature of 20º C, the battery suffers a 50% loss after 16 months, and at 40º C it loses the same charge in only 5 months. If the battery remains very weak for a period of several days, it cannot be recharged since the plates are sulphated and must be replaced.

3.2.- Installation and Start-up

The MTD 120 level meter is designed for use as a portable device. When the [2] key is pressed, the instrument is in the automatic power-off mode; that is, the device is automatically disconnected ﬁfteen

minutes after the last time a key has been pressed. When turning on the unit, automatic power-off mode may be deactivated by holding down the [2] key until you hear two acoustic indications, later "MANUAL POWER OFF" message will appear on the lower side of the monitor.

When the device is operating, it is also possible to select the manual power-off mode by means of the Manual power function of the TV functions menu.

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4.- OPERATING INSTRUCTIONS

4.1.- Description of the Controls and Elements

Figure 1.- Front panel.

[1]

On / Off key. This turns on the instrument, and the user can select either manual or automatic power-off.

[2] MONITOR.

Enables the measurement information displayed on-screen in TV mode (level measurement) to be selected.

[3] SCREEN.

Activation of VOLUME, CONTRAST, BRIGHTNESS, SATURATION (only ref. 4202) and HUE (this last only for NTSC colour system and ref. 4202) control menus.

[4] MAIN KEYBOARD

12 keys to select functions and entering numeric data.

Figure 2.- Main keyboard.

[5] ENTER.

Validation of the different options. In TV mode, press the ENTER [5] key to display a menu containing different functions, some are dependent on the band and the

standard:

Band switching Permits to change from terrestrial (5-862 MHz) to satellite band (920-2150 MHz) and vice versa.

A/D

SHIFT

CH/F

SPECT

LEVEL

MODE

SEARCH4MEMORY

LNB

SOUND

30 24

21 22 23

31 27 28 29

25 26

BATTERY OK CHARGER

EXT VIDEO

DRAIN

MONITOR

SCREEN

A/D

SHIFT

CH/F

SPECT

LEVEL

MODE

SEARCH4MEMORY

LNB

SOUND

Medidor de Campo Color TV&SAT MTD 120

ENTER

1 3 4 5

891011

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System & Standard Selects the colour system (PAL, SECAM or NTSC) and the TV standard (B/G, D/K, I, L, M, N or Digital). Battery & Lnb Displays battery voltage and external units power supply voltage and current (V Lnb and I Lnb). Data logger Permits to acquire and to store up to 9801 measurements automatically. Clock Displays time and date, and allows them to be modiﬁed. Input Video Enables Scart commutation signals to be activated, deactivated or set to automatic/subordinate mode. Channel set Selects active channels table. Units Selects the measuring units: dBµV, dBmV or dBm. Manual power Sets power-off as Manual or Automatic. C/N setup Deﬁnes the C/N measuring method between Auto or Referenced. Reference noise (Only in C/N Reference noise mode). Deﬁnes the frequency where measure the noise level. Channel BW (Satellite band or digital channels). Deﬁnes channel bandwidth. Indispensable for measuring digital channels

and satellite band channel C/N.

Lnb local osc (Only satellite band). It deﬁ nes the frequency of the local oscillator (L.O.) of the LNB. Video polarity (Only satellite band, analogue channels). This selects the polarisation of the video carrier. Nicam channel (Only analogue channels). This selects the NICAM sound channel that is sent to the loudspeaker. Search level (Only analogue channels). Selects the threshold level of the automatic station search function. Teletext (Only analogue channels). Sets teletext information. DiSEqC (Only satellite channels). Deﬁnes a sequence of DiSEqC commands and permits to send them. Beep Activates (ON) / deactivates (OFF) the beeper. Equipment info. Displays information on the instrument: serial number, version of control software, options installed, etc. Exit Exits from the function menu.

In Spectrum Analyser mode the menu displays the following functions: Band switching Permits to switch from terrestrial (5-862 MHz) to satellite band (920-2150 MHz) and vice versa. Span Deﬁnes the frequency range displayed between Full (the entire band), 500 MHz, 200 MHz, 100 MHz, 50

MHz, 32 MHz, 16 MHz and 8 MHz (the latter two only for terrestrial bands). Reference level Deﬁnes the reference level between 70 and 130 dBµV in 10 dB steps. Dual marker (Only analogue channels, level measurement mode and single marker mode). Enables dual markers to be

shown on the displayed spectrum.

Marker A (Only in dual marker mode). Selects marker A as the active marker (tuneable). Marker B (Only in dual marker mode). Selects marker B as the active marker (tuneable). Single marker (Only in dual marker mode). Activates the single marker on the displayed spectrum. Sweep Selects sweep speed in spectrum mode between Fast (fast sweep, low accuracy) and High Resolution

(slow sweep, high accuracy). Reference noise (Only in C/N measurements). Permits to deﬁne the frequency where noise level will be measured (see Carrier

function).

Channel bandwidth (Only in Channel Power measurements). Permits to deﬁne channel bandwidth (see Marker function). Marker (Only when measuring Channel power and after deﬁning the Channel bandwidth). Permits to change the

tuning frequency by means of the keys. Carrier (Only when measuring C/N Referenced and after deﬁning the Reference noise). Permits to change the tuning

frequency by means of the keys. Measure bandwidth Selects the bandwidth of the spectrum measuring ﬁlter from among:

Terrestrial channels: 230 kHz or 1 MHz. Satellite channels: 230 kHz or 4 MHz.

Channel set Selects active channels table. Battery & Lnb Displays battery voltage and external units power supply voltage and current (V Lnb and I Lnb). Exit Exits from the function menu.

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[6]

Tuning control and moving between the various on-screen menus. Tuning purposes: when pressing key, frequency increases while when pressing key, frequency decreases. To shift along the on-screen menus: when pressing key, active option moves upwards while when pressing key, active

option moves downwards.

[7] CHARGER.

External DC adapter operation indicator. When batteries are installed the battery charger is automatically activated.

[8] BATTERY OK.

Battery charge level indicator.

[9] DRAIN.

External units power supply indicator. Lights up when the MTD 120 supplies a current to the external unit.

[10] EXT VIDEO.

It lights up when an external video signal is present through the SCART connector [39].

[11] Monitor

[20] A/D

Switches between analogue and digital mode. Key number 0 to enter numeric data.

[21] SPECT.

Enables switching between the TV and the Spectrum Analyser operation mode, and back again. Key number 1 to enter numeric data.

[22] LEVEL.

Enables the type of measurement to be selected. The types of measurements available depend on the band, the standard, the options included and the operating mode.

Key number 2 to enter numeric data.

[23] MODE

Selects the information displayed on-screen in TV operation mode (LV measurement). Key number 3 to enter numeric data.

[24] SEARCH

This is the function for automatic station search. Starting at the present frequency or channel, it searches until ﬁnds a station with an adequate level. The threshold level (search level) can be deﬁned by means of the TV mode functions menu between 30 and 99 dBµV.

Key number 4 to enter numeric data.

[25] MEMORY

This key enables the measurement conﬁguration to be stored/recalled. Each conﬁguration has the following information: name assigned to memory, memory number, Channel or frequency (Freq), TV system (TV Sys), measurement mode (Meas), external units power supply (V Lnb), measurement units (Units) and Sound. The memory can store up to 99 measurement conﬁgurations (numbered from 1 to 99).

Key number 5 to enter numeric data.

[26] SOUND

This selects the type of sound. The options available in each case depend on the band and the standard selected (see section 4.11 Selecting the Sound Mode).

Key number 6 to enter numeric data.

[27] LNB

Enables selecting the power supply to the external units. Available voltages are: External, 13 V, 15 V and 18 V for the terrestrial band and External, 13 V, 15 V, 18 V, 13 V + 22 kHz, 15 V + 22 kHz and 18 V + 22 kHz for the satellite band.

Key number 7 to enter numeric data.

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[28] FA

Direct access key which can be assigned to any function on any menu. Key number 8 to enter numeric data.

[29] FB

Direct access key which can be assigned to any function on any menu. Key number 9 to enter numeric data.

[30] CH/F

Switches tuning mode between channel and frequency. In channel mode the tuning frequency is deﬁned by the active channels table (CCIR, OIRT, ...). See channel-frequency tables in Appendix A.

Decimal point key to enter numeric data.

[31] SHIFT

Enables the desired frequency to be directly tuned using the numeric keyboard. Also acts as a SHIFT key for moving across different ﬁelds on some screens.

Figure 3.- Side panel connections.

[35] RF . RF signal input.

Maximum level 130 dBµV. Universal connector for F/F or F/BNC adapter, with input impedance of 75Ω.

ATTENTION Note the importance to protect the RF [35] input signal with an accessory to block the AC voltages used in CATV cables

(needed to feed the ampliﬁers) and remote mode.

[36] RESET button

Enables the user to restart the instrument if there is any irregularity in its functioning. If it is necessary to reset the instrument, press the reset button with the instrument turned off.

[37] Connector RS-232C

Enables the remote control of the MTD 120 from a personal computer, as well as data dumping to a printer.

[38] External 12 V power supply input [39] Scart socket

RST

RS-232C

SCART ITF

EXT.

SUPPLY

383635 37

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4.2.- Adjustment of Volume and Monitor Parameters

Repeatedly pressing key SCREEN [3] sequentially activates the VOLUME, CONTRAST, BRIGHTNESS, SATURATION and HUE (this

last only for NTSC colour system) control menus. On activation of a menu for a speciﬁc parameter the screen displays a horizontal bar whose length is proportional to the parameter level, to modify this value simply press keys [6]. To exit the menu and validate the new value

press key ENTER [5].

4.3.- Selecting the Operation Mode: TV / Spectrum Analyser

The MTD 120 has two basic operation modes: TV and Spectrum Analyser. To switch from one operation mode to the other press key

SPECT [21].

In the TV operation mode the demodulated television signal is shown on-screen; this is the default operation mode, various functions can

be selected, as shown in the following paragraphs.

In the Spectrum Analyser operation mode the screen displays the power spectrum of the active band (terrestrial or satellite). The span,

the reference level and the measuring ﬁlter bandwidth are variable as will be shown in paragraph '4.10 Spectrum Analyser Operation Mode'.

4.4.- RF Band Selection: 5-862 MHz / 920-2150 MHz

Tuning is continuous between 5 and 862 MHz (terrestrial band) and between 920 and 2150 MHz (satellite band). There are three ways of

changing the active band:

1. Press key ENTER [5] to accede to the functions menu, if necessary press keys [6] to select the Band switching function and then press key ENTER [5] again. The RF band will be switched automatically.

2. Press key SHIFT [31] and select a frequency on the new band using the numeric keyboard. The ﬁfth digit and second decimal act as conﬁrmation. For example, if the active band is the 920 to 2150 MHz band and you wish to tune the 49 MHz frequency (belonging to the 5/45 to 862 MHz band), press key SHIFT [31] and then enter 49.00 or 0049.0 using the numeric keyboard.

3. Recall a memory with a tuning frequency belonging to the band you wish to access. (See section '4.12 Measurement Conﬁguration Memories').

4.5.- Channel Tuning / Frequency Tuning

Pressing key CH/F [30] the MTD 120 switches from frequency tuning to channel tuning and back again.

In channel tuning mode pressing keys [6] sequentially tunes the channels deﬁ ned in the active channels table (see the Channel set function in the TV mode functions menu, section '4.9.2.7 Selecting the Channels Table'). Pressing key frequency increases while pressing key frequency decreases.

In frequency tuning mode there are two ways of tuning:

1. Pressing keys [6]. By means of keys [6] selects the desired frequency (tuning is continuous from 5 to 862 MHz and from 920 to 2150 MHz). When

pressing key frequency increases while pressing key frequency decreases.

2. Using the keyboard.

Press key SHIFT [31](the frequency listing will disappear), next enter the frequency value in MHz using the numeric keyboard, the ﬁfth digit and the second decimal act as conﬁrmation. The MTD 120 will calculate the tuneable frequency closest to the entered value and then display it on-screen.

4.6.- Búsqueda Automática de Emisoras

In the TV mode, by pressing the SEARCH [24] key search starts at the present frequency or channel until it ﬁ nds a transmission with a level higher than the search level. The threshold level is deﬁned by means of the Search level function of the TV mode functions menu (see paragraph '4.9.2.15 Search Level'.).

The Search function halts the search process when the end of the present band is reached, if it is in frequency mode, or when a key is pressed. In channel mode, the search process is halted when the last channel of the group selected is reached (see Appendix A). The sound is deactivated during the search process.

4.7.- Selecting Analogue / Digital Mode

Measuring the characteristics of a channel depends, in the ﬁrst place, on the type of modulation: analogue or digital.

Use key A/D [20] to switch between analogue and digital channels. When switching to a new modulation, the MTD 120 activates the last measurement conﬁguration used for that modulation.

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4.8.- External Units Power Supply (EXT. SUPPLY)

The MTD 120 can supply the voltage needed to power the external units (antenna preampliﬁers, in the case of terrestrial TV, or LNB, in the case of satellite TV).

Maximum input levels

DC to 100 Hz 50 V rms (powered by the power adapter)

30 V rms (not powered by the power adapter)

5 MHz to 2150 MHz 130 dBµV

To select the supply voltage of the external units, press key LNB [27], and the screen will display a functions menu labelled EXT. SUPPLY listing the choice of voltages (which will depend on the band being used). Use keys [6] to select the desired voltage and

press key ENTER [5] to activate it. The following table shows the choice of supply voltages:

Table 1.- External units powering voltages.

In the External power supply mode the unit powering the ampliﬁers before the antenna (terrestrial television) or the satellite TV receiver (house-hold or community) also powers the external units.

The DRAIN [9] indicator lights when current is ﬂowing to the external unit. If any kind of problem occurs (e.g., a short circuit), an error message appears on the monitor ('SUPPLY SHORT'), the acoustic indicator will be heard and the instrument will cease to supply power. The

MTD 120 does not return to its normal operating state until the problem has been solved.

WARNING

When the external unit is powered with one of these voltages, particulary 18 V, it is not advisable for the instrument to function for more than three minutes non-stop. Since the total consumption is very high, the duration of the battery charge is shortened considerably. It is advisable to disconnect the instrument when it is not taking measurements.

Band Powering voltages

SATELLITE External

13 V 15 V 18 V 13 V + 22 kHz 15 V + 22 kHz 18 V + 22 kHz

TERRESTRIAL External

13 V 15 V 18 V

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4.9.- TV Operating Mode

4.9.1.- Selecting the Measurement Mode (MEASURE)

The types of measurements available depend on the band, the standard, the operating mode and the options included in the appliance.

Terrestrial band - Analogue channels:

Level Level measurement of the currently tuned carrier.

Video / Audio Video carrier to audio carrier ratio.

C / N Video carrier to noise ratio. There are two methods to make this measurement (selectable through the C/N setup

function): Auto: In-channel measurement. Noise level is measured at a frequency where modulation contents is minimum. After

a small period of time, minimum measured level corresponds to noise level. Referenced: The user deﬁnes the frequency where noise level will be measured (by means of the Reference noise

function). This frequency will be used to measure noise level for all channels.

Terrestrial band - Digital channels:

Channel power Automatic method: channel power is measured assuming that power spectral density is uniform throughout channel

bandwidth. To measure it correctly it is indispensable to deﬁne the Channel BW.

C/N Two methods selectable through the C/N setup function:

Auto: Out-channel measurement. Noise level is measured at f

noise

= f

tuning

- 1/2 Channel BW. To measure it correctly

digital channel must be tuned at its central frequency. Referenced: The user deﬁnes the frequency where noise level will be measured (by means of the Reference noise

function). This frequency will be used to measure noise level for all channels.

Satellite band - Analogue channels:

Level Level measurement of the currently tuned carrier.

C/N Video carrier to noise ratio (Auto or Referenced, equivalent to terrestrial band, digital channels).

Satellite band - Digital channels

Channel power Automatic method.

C/N Channel level to noise ratio (Auto or Referenced, equivalent to terrestrial band, digital channels).

To change the measurement mode press key LEVEL [22]. The screen will display a menu with the measurement modes which can be selected.

Figure 4.- Measuring mode selection (satellite band, analogue channels).

To select a measurement mode press keys [6] until it is marked (e.g., Level in the previous ﬁgure), then press key ENTER [5] or key LEVEL [22] to activate the selected measurement mode.

MEASURE

Level

C/N (Referenced) Exit

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4.9.1.1.- Measuring the Video Carrier Level (Level)

If you select the Level measurement mode, the screen shows a window with the signal level, when selected with the key MONITOR [1] (see next section).

WARNING

If a sudden signal level increase is produced at the RF input, and it is beyond the total signal levels of:

Terrestrial band: 95 dBµV Satellite band: 105 dBµV

the tuning circuit may become out of control, giving as a result wrong level readings.

If this situation occurs, disconnect the input signal, change to Spectrum Analyser mode and select a Reference Level of 130 dBµV. Then connect the signal again and modify the Reference Level according to present signals.

Similar effects can be observed when at the RF input appears an important number of carriers with a high level. To be able to determinate the equivalent level of a carrier group (with similar levels) at the RF input, it is possible to use the expression:

= L + 10 log N

: equivalent total level L: average level of the carriers group N: number of carriers

So, if there are ten carriers with a level around 90 dBµV, their equivalent level will be:

90 dBµV + 10 log 10 = 100 dBµV Observe that in this case, loss of tuning by overload of the RF input may occur besides other effects such as tuner saturation and

generation of intermodulation products that may mask the spectrum visualization.

4.9.1.1.1.- On-screen Measurement Information

In TV operation mode, the measurement information to be displayed on-screen is selected by pressing key MONITOR [1]. Three

possibilities are offered, selected cyclically:

- TV image with a window in the lower part of the screen displaying the signal level and frequency/channel.

- TV image with a window displaying information on the name assigned to memory, power supply to external units, sound, colour system, TV standard, level and frequency/channel.

- TV image only.

4.9.1.1.2.- Selecting TV Mode: TV, LV, SY (TV MODE)

In addition to operating as a television set, the monitor of the MTD 120 can act as an analogue level indicator, and can display the line

synchronising pulse just as it would appear on a screen of an oscilloscope.

To change the TV mode press key MODE [23], and the following screen will appear:

Figure 5.- TV mode selection.

Use keys [6] to choose the information you want to be displayed on-screen. Press key ENTER [5] or key MODE [23] to activate

the selected display mode.

TV MODE

TV+LV TV+LV+SYNC LV

Exit

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The operation modes available are:

TV: Monitor operating as a conventional television set. TV+LV: Monitor operating as a conventional television set, with a level indicator on the upper part of the screen (the

analogue bar).

TV+LV+SY: Monitor operating as a conventional television set, with a level indicator and the line synchronizing pulse

displayed on the screen.

LV: Signal level indicationon the upper part of the screen (analogue bar).

Operation in TV+LV+SY Mode

This function permits to display the line synchronising pulse corresponding to a tuned signal on the monitor. To view the synchronisation pulse press key MODE [23], use keys [6] to select TV + LV + SY mode, and then press key MODE

[23] or key ENTER [5].

The monitor is divided into three sections. In the top section an analogue bar appears which indicates the level of the signal received (79 dBµV in ﬁgure 6 example). On the left side the line synchronising pulse is represented as it would appear on the screen of an oscilloscope. On the lower side the TV picture is shown.

Figure 6.- Line synchronism + level + TV (TV+LV+SY).

Starting from the line synchronism representation, it is possible to perform a qualitative analysis of the TV picture delivered to the end user.

4.9.1.2.- Measuring the Video / Audio Ratio (V/A)

In the Video/Audio measurement mode, the screen displays the following information:

Figure 7.- Video/Audio rate measurement.

In addition to the video carrier / audio carrier ratio (15.0 dB in previous ﬁgure) this also shows the frequency or channel, depending on the tuning mode selected, and the level of the video carrier and audio carrier.

VIDEO/AUDIO

15.0 dB

VIDEO CARRIER:

Frequency = 519.25 MHz Level = 60.2 dBuV

AUDIO CARRIER:

Frequency = 5.50 MHz Level = 45.2 dBuV

60 70 80 90 100

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4.9.1.3.- Measuring the Carrier / Noise Ratio (C/N)

The MTD 120 offers two ways to make this measurement:

Auto: The MTD 120 deﬁnes the frequency where noise level is measured automatically.

Reference noise: The user deﬁnes the frequency where noise level is measured (by means of the Reference noise function). This frequency

will be used to measure noise level for all channels.

To select the measuring method activate the TV mode functions menu by pressing key ENTER [5], then use keys [6] to select C/N

setup function and ﬁnally press key ENTER [5] again. The monitor will show a screen displaying two possibilities: C/N (Auto) and C/N (Reference noise), then use keys [6]to select the desired option and ﬁnally press key ENTER [5] to conﬁrm.

When selecting the C/N (Reference noise) mode it is necessary to deﬁne the noise frequency: access the functions menu and now use keys

[6] to select Reference noise function and ﬁnally press ENTER [5] again. A screen titled REFERENCE NOISE will be displayed showing the noise frequency in use. To change it press key SHIFT [31], the current frequency value will disappear and, using the keyboard, you will be able to enter the new reference noise frequency in MHz and with two decimals ﬁgures. This frequency also can be modiﬁed in the Spectrum operation mode (see 4.10.2.2. C/N (Referenced Measurement).

The MTD 120 carries out C/N ratio measurement in four different ways, according to the carrier type and the band in use:

A) Terrestrial band, analogue carrier

Carrier level is measured using a quasi-peak detector (230 kHz BW). Noise level is measured with an average detector and corrected to refer it to channel bandwidth (according to the standard in use).

B) Terrestrial band, digital carrier

Both measurements are done with an average detector (230 kHz) and the same corrections are introduced on them (bandwidth corrections).

C) Satellite band, analogue carrier

Carrier level is measured using a quasi-peak detector (4 MHz BW). Noise level is measured with an average detector (4 MHz) and corrected to refer it to channel bandwidth.

D) Satellite band, digital carrier

Equivalent to case B but now using the 4 MHz BW ﬁlter.

On selecting the Carrier / Noise measurement mode the screen displays the following information:

Figure 8.- Carrier-to-noise ratio measurement (Satellite band, analogue signal).

As well as the video carrier / noise level ratio (20.1 dB in previous ﬁgure), the frequency or channel (depending on the tuning mode

selected) and the level of the video carrier and noise level are also shown.

When measuring channels in the satellite band or digital channels, to measure the C/N ratio correctly, the bandwidth of the channel must be

deﬁned previously, using the Channel BW function on the TV mode functions menu.

IMPORTANT REMARK

To measure digital channels C/N ratio in Auto mode it is indispensable to tune channel at its central frequency.

IMPORTANT REMARK

In the case of an analogue terrestrial signal, when C/N (Auto) mode is selected, the MTD 120 performs an in-channel measurement, this involves that C/N value will take several seconds to stabilize (six seconds at the most). An arrow below the C/N readout represents the measurement cycle and it is necessary to wait the arrow passes twice on the same point to guarantee a correct measurement.

C/N (Auto)

20.1 dB

VIDEO CARRIER:

Frequency = 1345.5 MHz Level = 64.1 dBuV

NOISE:

Frequency = 1329.5 MHz Power = 44.1 dBuV Channel BW = 32.0 MHz

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4.9.1.4.- Measuring the Power of Digital Channels (Channel power)

The MTD 120 offers two different methods to measure digital channels power, according to the active operation mode: Automatic method in TV mode and Integration method in Spectrum mode. The Automatic method measures digital channel power in the measurement ﬁlter bandwidth and estimates total channel power assuming that spectral density is uniform throughout channel bandwidth. On the other hand, the Integration method takes into account signal spectral distribution so measurement is more accurate (see 4.10.2 Selecting the Measurements Mode). The obtained readouts using these methods may differ some dBs, specially when the digital signal is degraded.

Figure 9.- Measuring digital power.

On selecting the CHANNEL POWER measurement mode, the screen displays the following information:

Figure 10.- Digital channel power measurement.

In addition to the power of the digital channel (45.8 dBµV in previous ﬁgure) this also shows the tuning frequency or channel, depending on the tuning mode selected, and the parameters regarding bandwidth: Channel BW and measuring ﬁlter bandwidth (Measure BW).

For the power measurement of a digital channel to be correct it is essential to have previously deﬁned the channel bandwidth using the Channel BW function, in the TV mode functions menu (see section '4.9.2.11 Channel Bandwidth’).

CHANNEL POWER

45.8 dBuV

DIGITAL CARRIER:

Frequency = 538.00 MHz

BANDWIDTH PARAMETERS:

Channel BW = 8.00 MHz Measure BW = 230 KHz

TV mode

Channel BW

Marker

Spectrum

Channel BW

Marker

Power measurement by integration method

Digital channel power

Mesure BW

Power measurement by the automatic method

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4.9.2.- TV Mode Functions Menu

In TV operation mode, press key ENTER [5] to access the functions menu of the TV mode:

Figure 11.- TV mode functions menu.

Use keys [6] to choose the different functions: pressing key active option moves upwards while pressing key active option moves downwards. The downwards or upwards facing arrow at the bottom or top-left hand side of the functions menu indicates there are

more menus which can be accessed by pressing keys [6].

Below we describe the use of each function and its range of values.

4.9.2.1.- Selection of the RF Band: (Band switching)

Permits to switch from terrestrial (5-862 MHz) to satellite band (920-2150 MHz) and vice versa.

4.9.2.2.- Selection of the TV System and Standard (System & Standard)

This function enables the television system and standard to be changed. The standards which can be selected depend on the band in use (terrestrial or satellite channels). To change the standard access the TV mode functions menu, then use keys [6] to select the System

& Standard function and press key ENTER [5]. A fold down menu will appear listing the following options:

Terrestrial bands Satellite band

PAL-B/G PAL PAL-D/K SECAM PAL-I NTSC PAL-M Digital PAL-N SECAM-B/G SECAM-L SECAM-D/K NTSC-M Digital

Use keys [6] to select the desired standard and press key ENTER [5] to activate it.

If a digital channel is selected, whether terrestrial or satellite, for the measurement of the level and the carrier-to-noise ratio to be correct, the bandwidth of the channel must be deﬁned, using the Channel BW function of the functions menu.

The following table shows the features of the analogue terrestrial channel standards.

FUNCTIONS

Band switching

System & Standard Battery & Lnb Data logger Clock Input video

FUNCTIONS

Band switching System & Standard

Battery & Lnb

Data logger Clock Input video

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Table 2.- Selectable terrestrial analogue standards and their characteristics.

4.9.2.3.- Batteries and External Units Power Supply (Battery & Lnb)

This function allows you to check the charge state of the batteries, as well as the supply current and voltage of the external units. From the TV operation mode, simply press key ENTER [5] select the Battery & Lnb function and press key ENTER [5]again. You will see a screen like the following one:

Figure 12.- Battery&Lnb function.

The top part of the screen displays the battery voltage (6,1 V in previous ﬁgure), both numerically and with a bar graph. The arrow labelled L Bat below the horizontal bar signals the low battery level where the battery should be charged. When batteries are fully charged, battery voltage indication is 6.1 V or higher.

The bottom of the screen shows the voltage supplied to the external units (V LNB, 12.6 V in the ﬁgure above) and the current supplied (I LNB, 200.0 mA in the example).

To leave this function press key ENTER [5].

4.9.2.4.- Data Logger Function

The Data logger function allows the user to carry out, store and/or print out up to 9801 measurements in a fully automatic way. It may be understood as a measurement matrix whose columns address the 99 measuring conﬁgurations (deﬁned in the 99 memories of the equipment) and whose lines permit to store 99 measurements for every measuring conﬁguration (conducted in different points of the system or in the same point on different times).

Before to proceed to take measurements by means of the Data logger function it is necessary to store the measuring conﬁguration/s in the memory by using the Store function (see paragraph 4.12.1).

To select the Data logger function activate the TV mode functions menu, by pressing key ENTER [5] when in the TV operation mode. Then, use keys [6] to select the Data logger ﬁeld and press key ENTER [5], the DATALOGGER screen will appear automatically.

BA TTER Y : 6.1 V

V LNB : 12.6 V I LNB : 200 mA

L Bat

System Lines/frame Channel Bandwidth Video/sound separation Video mode Audio mode

B 625/50 7 MHz 5,5 MHz Neg FM D 625/50 8 6,5 Neg FM G 625/50 8 5,5 Neg FM H 625/50 8 5,5 Neg FM

I 625/50 8 6,0 Neg FM K 625/50 8 6,5 Neg FM L 625/50 8 6,5 Pos AM M 525/60 6 4,5 Neg FM N 625/50 6 4,5 Neg FM

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Figure 13.- DATALOGGER screen.

As you can see in the previous ﬁgure, the main screen of the Data logger function has three functions: Conﬁg (Conﬁguration), Run and

Exit. Below these three functions is the measurements matrix, three columns and ﬁve rows are simultaneously displayed (in the previous

ﬁgure the data logger has three stored measurements, one for each of the ﬁrst three memories).

To access the various screen functions or ﬁelds press key SHIFT [31] repeatedly.

4.9.2.4.1.- Conﬁguring the Data Logger Function

The conﬁguration menu of the Data logger function allows you to choose between taking and/or printing measurements, programming the MTD 120 to take measurements at a pre-determined time, deﬁning the time interval between measurements, erasing all measurements stored in the Data logger function, and automatically deactivating all the measurement conﬁgurations.

To deﬁne the conﬁguration of the Data logger function press key SHIFT [31] repeatedly until you have selected the Conﬁg ﬁeld and then press key ENTER [5]. The conﬁguration screen of the Data logger function will then appear.

Figure 14.- Conﬁguration of the DATA LOGGER function

After an interval of half a minute without the MTD 120 controls being touched, it will automatically return to the Data logger function main screen.

1.- TO MEASURE, PRINT OR MEASURE AND PRINT?

First of all, the user must indicate whether he wants to take measurements or to print them, or to do both at the same time. To do this, press key SHIFT [31] repeatedly until positioned in the Measure ﬁeld. Then use keys [6] to activate (On) or deactivate (Off) the

measurement function and press key SHIFT [31]. The next step is to activate or deactivate the measurement printing function. To do this, use the key SHIFT [31] to position the cursor in the Print ﬁeld and activate it (On) or deactivate it ( Off) using keys [6] and pressing key

ENTER [5] validate the new state.

2.- PROGRAMMING THE ALARM

To program the instrument to take measurements and/or print-outs at a speciﬁc time, you must deﬁne the time and date the measurements are to be taken (Start acquisition time). If this ﬁeld is not deﬁned the acquisition of measurements will have to be activated manually (see section '4.9.2.4.3 Taking Measurements'). When programming the alarm be sure to have checked that the date and time have been correctly deﬁned beforehand (Clock function, paragraph 4.9.2.5) and to have selected previously one measurement to be taken at minimum (see section '4.9.2.4.2 Selecting the Measurements to be Taken').

To deﬁne the starting time of measurement acquisition repeatedly press key SHIFT [31] until the Start acquisition time ﬁeld blinks, then

DATALOGGER

Measure: On Print: Off Start acquisition time:

.. : .. : .., .. / .. Measure interval: 00 : 15 Clear Unselect

DATALOGGER

•> Conﬁg • Run • Exit

1 2 3 1 49.8 55.2 53.4

2 ... ... ...

3 ... ... ...

4 ... ... ...

5 ... ... ...

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press key ENTER [5]. This will lead to a screen like the one shown below:

Figure 15.- Deﬁning the starting time of measurement acquisition.

The ﬁrst line of this screen tells you if the alarm function is on (ALARM On) or not (ALARM Off), followed by the date and time the alarm

has been set for, and the last line shows the current time and date.

Repeatedly pressing key SHIFT [31] cyclically activates the different ﬁelds in the following order: Hour, Minute, Second, Day, Month and

Alarm (alarm state). To alter any of these simply activate it, using keys [6] and press key SHIFT [31] again. Once you have updated all the alarm ﬁelds, press key ENTER [5] to validate them and exit the screen.

If before activating the alarm (ALARM On) no measurement matrix cell has yet been activated (see section '4.9.2.4.2 Selecting the Measurements to be Taken'), the bottom of the screen will show the error message "NOT CELLS SEL." (No cells have been selected) followed by "DL STOPPED" (Data Logger deactivated).

On reaching the time deﬁned in the Start acquisition time ﬁeld, the instrument will switch itself on (if it was switched off) or go to the

Data logger mode (if switched on) to automatically take the measurements and/or produce the print-out.

3.- MULTIPLE MEASUREMENTS: INTERVAL BETWEEN MEASUREMENTS

In the case of having to take multiple measurements at different times the Measure interval will have to be deﬁned. This ﬁeld speciﬁes the time interval between measurements/print-outs. To deﬁne it, from the Data logger conﬁguration screen, repeatedly press key SHIFT [31]

until the section dealing with time in the Measure interval ﬁeld has been activated, deﬁne the hours by using keys [6], then press key SHIFT [31] again to go to the minutes ﬁeld and deﬁne these in the same way. Finally press key SHIFT [31] again to validate the deﬁned time interval.

You can make as many acquisitions as there are activated rows in the measurement matrix (if only one row has been activated, then only one measurement will be taken).

In the case where the Data logger function has been programmed to take more than one measurement in the time domain, i.e. more than one row has been activated and the acquisition interval is greater than four minutes, then every time an acquisition is made the instrument will reprogram the alarm for the next measurement. Then it will switch itself on three minutes before the time deﬁned in the Measure Interval ﬁeld in order to warm up and ensure the highest accuracy.

4.- ERASING MEASUREMENTS STORED IN THE DATA LOGGER AND AUTOMATIC DEACTIVATION OF ALL THE CELLS.

The conﬁguration screen also allows you to erase all the measurements stored in the Data Logger function, as well as automatically deactivating all the activated measurement conﬁgurations. To erase the stored measurements select the Clear ﬁeld and press key ENTER [5]. To deactivate the measurement conﬁgurations select the Unselect ﬁeld and press key ENTER [5].

5.- EXITING THE CONFIGURATION SCREEN

To exit the Data logger function conﬁguration screen press key ENTER [5].

ALARM Off

Hour : 07 Day : 01 Minute : 00 Month : 05 Second : 00

Time 12:03:16 30/04/1999

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4.9.2.4.2.- Selecting the Measurements to be Taken

Once the Data logger function has been conﬁgured, activate the measurement conﬁguration(s) (columns) which you would like to use. The headings of the measurement matrix columns of the Data logger function coincide with the number of memorised measurement conﬁgurations, simply place the cursor over each column and you will see the more important parameters displayed at the bottom of the screen (name assigned to the memory position, frequency/channel, measurement mode and units of measurement).

To activate the measurement conﬁgurations repeatedly press key SHIFT [31] until the cursor is placed on the columns ﬁeld, next pressing keys [6] until it is positioned in the column (memory) that you wish to activate and press key ENTER [5]. The activated

columns are more brilliant than the non activated ones. To deactivate a column follow the same steps as in activating it.

To activate rows where you wish to store measurements use key SHIFT [31] to place the cursor on the rows ﬁeld, then press keys

[6] until it is over the row you want to activate and press key ENTER [5]. The activated rows are more brilliant than the non activated ones. To deactivate a row follow the same steps as in activating it. In the case of activating more than one row, the time interval between the measurement of each row is determined by the Measure interval parameter deﬁned in the conﬁguration screen (1 minute by default).

4.9.2.4.3.- Taking Measurements

In addition to execution by alarm (see section '4.9.2.4.1 Conﬁguring the Data Logger Function') there are three more ways to take

measurements:

a) Acquisition over a time period.

The measurement deﬁned in a memory (column) will be taken as many times as there are activated rows, as speciﬁed by the time interval between measurements deﬁned in the conﬁguration menu (Measure interval).

Process: place the cursor on the column you want and press key ENTER [5] until the ﬁrst active cell blinks. If no measurement matrix row has been previously activated, the bottom of the screen will show the error message "NOT CELLS SEL." (No cells selected).

b) Acquisition of different measurements at the same moment.

Multiple measurements in a row will be taken, as speciﬁ ed by the measurement conﬁgurations deﬁned in all the activated columns. Process: place the cursor on the row you want and press key ENTER [5] until the active cells blink. If no measurement matrix column

has been previously activated, the bottom of the screen will show the error message "NOT CELLS SEL.".

c) Multiple acquisitions.

All the measurements deﬁned by all the activated rows and columns will be taken, in the case where more than one row has been activated the time interval between measurements will be that deﬁned in the Measure interval ﬁeld of the conﬁguration menu.

Process: select the Run function and press key ENTER [5]. If no measurement matrix element has been previously activated, the bottom of the screen will show the message "NOT CELLS SEL.".

If any key is pressed during the acquisition process, the acquisition process will abort and the screen will display the message "DL

STOPPED" (Data Logger deactivated).

4.9.2.4.4.- Exiting the Data Logger Function

To exit the Data logger function select the Exit ﬁeld using key SHIFT [31] then press key ENTER [5].

4.9.2.4.5.- Examples of Data Logger Function Applications

The Data logger function has many applications such as channel equalisation and measuring signal attenuation at each pickup.

Band Equalisation (frequency acquisition)

For this application you will need to use a noise generator as the signal source in the place of a receiver antenna. If, lets say, you wish to

verify equalisation on the VHF band, then:

1. Deﬁne the following tuning frequencies at 8 memory positions: from 50 to 450 MHz in 50 MHz steps. The measurement to be taken will be the level measurement.

2. In the Data logger function, activate the columns related to the memories deﬁned in the previous step.

3. Next place the cursor on the row where you want to store the measurements and press key ENTER [5] until the ﬁrst of the cells blinks.

The measurements obtained will allow you to verify if the signal level is uniform across the entire band.

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Measuring signal level ﬂuctuation at a pickup (acquisition over a time period)

1. Deﬁne the acquisition time interval Measure interval (1 h for example).

2. Activate a column (a measurement conﬁguration you consider signiﬁcant).

3. Activate the necessary number of rows to be able to perform the study over the decided upon period of time, taking into account the previously deﬁned acquisition interval (e.g. for a 24 hour study with an acquisition interval of 1 h you will need to activate 24 rows).

4. Finally place the cursor on the activated column and press key ENTER [5] until the ﬁrst active cell blinks.

The report obtained will allow you to guarantee the correct operation of the installation.

4.9.2.5.- Clock

An internal clock permits to record date and hour of data acquisitions. To modify the time/date access the TV mode functions menu, press keys [6] to select the Clock function and press key ENTER

[5] to activate it. The monitor will show a screen labelled CLOCK displaying the hour, minute, second, day, month and year.

To alter any parameter repeatedly press key SHIFT [31] until the parameter you want to modify appears shadowed, then press keys

[6]. If you want to alter more parameters repeatedly press key SHIFT [31] again. To validate the changes made and exit press key

ENTER [5].

4.9.2.6.- Input Video

The Input video function enables Scart connector signals to be controlled. There are three possibilities:

Scart Auto Normal Scart operation Scart On External video operation mode Scart Off Scart deactivated

To select the Scart operation mode, access the TV mode functions menu, press keys [6] to the Input video function and press

key ENTER [5] to activate it. The monitor will show a screen labelled INPUT VIDEO displaying the three available options (as well as the Exit option). Press keys [6] to select the mode you require, then press key ENTER [5] to activate it.

4.9.2.7.- Selecting the Channels Table (Channel set)

The MTD 120 comes with twelve stored channel tables as standard (four for terrestrial television and eight for satellite), for greater

adaptability to the selection requirements of different countries or zones. See the channel-frequency table in appendix A of the manual.

To modify one channel table, access the TV mode functions menu, press keys [6] to select the Channel set function and press

key ENTER [5] to activate it. The monitor will then show the CHANNEL SET screen. Press keys [6] to select the desired table and then presss key ENTER [5] again to activate it.

4.9.2.8.- Measurement Units

The MTD 120 offers three measurement units to measure level and channel power: dBµV, dBmV and dBm. To select the units of measurement, access the TV mode functions menu, press keys [6] to select the Units function and press

key ENTER [5] to activate it. The monitor will show a screen labelled UNITS displaying the three available options (as well as the Exit option). Press keys [6] to select the units you require, then press key ENTER [5] to activate it.

4.9.2.9.- Power Off Mode (Manual power)

The MTD 120 offers two power-off modes: Manual and Automatic (unit disconnects automatically after 15 minutes without operating on

any control).

To select the power-off mode, access the TV mode functions menu, press keys [6] to select the Manual power function and press

key ENTER [5] to activate it. The monitor will show a screen labelled POWER OFF displaying the two available options (as well as the Exit option). Press keys [6] to select the power-off mode you require, then press key ENTER [5] to activate it.

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4.9.2.10.- C/N setup

To measure C/N the MTD 120 offers two different modes in TV mode:

C/N (Auto) The MTD 120 deﬁnes automatically the frequency where noise level is measured, according with:

noise

= f

tuning

- 1/2 Channel BW

C/N (Reference noise) The user deﬁnes the frequency where noise level is measured (by means of the Reference noise

function). This frequency will be used to measure noise level for all channels.

To select C/N mode, access the TV mode functions menu, press keys [6] to select the C/N setup function and press key ENTER

[5] to activate it. The monitor will show a screen labelled C/N SETUP displaying the two available options (as well as the Exit option). Press keys [6] to select the mode you require, then press key ENTER [5] to activate it.

4.9.2.11.- Channel Bandwidth (Channel BW)

To measure the power and C/N ratio of digital channels, as well as the C/N ratio of satellite band channels, you ﬁrst need to deﬁne the

channel bandwidth.

To modify the bandwidth access the TV mode functions menu and select the Channel BW function, press key ENTER [5] to activate it. The CHANNEL BANDWIDTH screen will be displayed. To alter the bandwidth value press key SHIFT [31], the bandwidth will disappear and, using the keyboard, you will be able to enter the new digital channel bandwidth in MHz and with two decimals.

4.9.2.12.- LNB Local Oscillator Frequency (Lnb local osc)

This option only affects reception of satellite band signals when using the channel tuning mode. This function deﬁnes the LNB local oscillator frequency used in the installation where the MTD 120 has been connected. Given that the MTD 120 satellite channel tables have been deﬁned in the Ku band and the MTD 120 tunes in IF (like all satellite receivers) the LNB local oscillator frequency has to be deﬁned to correctly tune the channel mode.

To modify this parameter access the TV mode functions menu (satellite band), press keys [6] to select the Lnb local osc function and press key ENTER [5] to activate it. The monitor will show a screen labelled LNB LOCAL OSCILLATOR displaying the current value of the LNB local oscillator frequency. To alter this value press key SHIFT [31], the current value will disappear and the new value can now be entered using the keyboard.

The frequency of the LNB local oscillator is expressed in MHz, with 5 ﬁgures for the whole part, a decimal point and a decimal ﬁgure (which acts as conﬁrmation). For example, to select 9 GHz the number 9000.0 has to be entered. Values must be deﬁ ned between 8000.0 and 12000.0.

4.9.2.13.- Video Polarity

This option affects reception of SAT (satellite) band signals. It allows selection of either negative and positive video polarity.

To modify the polarity access the TV mode functions menu (satellite band), select the Video Polarity function, and press key ENTER [5] to activate it. The monitor will show a screen labelled POLARITY displaying two possibilities: Positive Video and Negative Video. Pressing

keys [6] mark the option you require and ﬁnally press key ENTER [5] to activate it.

4.9.2.14.- NICAM Channel

Use this function to verify NICAM sound modulations in stereo and dual, you can also select the sound channel coming over the speaker.

To change the decoded channel access the TV mode functions menu, select the Nicam channel function, and press key ENTER [5] to activate it. The monitor will show a screen labelled NICAM offering two possibilities: Channel A and Channel B. Press keys [6] to

select the desired option and ﬁnally press key ENTER [5] to activate it.

4.9.2.15.- Search Level

Use this function to modify the threshold level of the automatic station search. To change the level place the cursor on the Search level ﬁeld and press key ENTER [5]. The monitor will display a window showing the current value of the search level, to alter it press key SHIFT [31] and enter the new value on the keyboard. Conﬁrmation is automatic on entering the second digit.

4.9.2.16.- Teletext

When the Teletext function is selected, Teletext information appears on the monitor if a transmitter with this information is tuned. The ﬁrst page to appear on the screen is always page 100. If Teletext data is received, a counter located on the upper edge of the screen indicates the page that is being processed. To change active page press key SHIFT [31], and introduce the new number using the numeric keyboard (third digit acts as conﬁrmation).

If the page requested is not included in the Teletext service of the transmitter, the search will continue indeﬁnitely. In such a situation the user can halt the search process, either by entering a new page number or by exiting the Teletext function pushing any control relative to another function.

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The Teletext function is especially valuable for the ﬁnal optimization process in TV installations. Any interference or reception through indirect beams generates digital in the digital information of the Teletext, which are highly visible as erroneous characters on the screen.

4.9.2.17.- DiSEqC (*) Command Generator

DiSEqC ('Digital Satellite Equipment Control') is a communication protocol between the satellite receiver and the accessories of the installation (switches, LNBs, etc.) proposed by Eutelsat, with the aim to standardize the diversity of switching protocols (13 - 15 - 18 V, 22 kHz, 60-400 Hz) and to satisfy the demands of the digital TV installations.

To deﬁne and/or to send a DiSEqC commands sequence, from the TV operation mode, press key ENTER [5], select the DiSEqC function using keys [6] and press key ENTER [5] again. A screen like next one will appear:

Figure 16.- DiSEqC commands screen.

DiSEqC screen is divided in 3 areas: the ﬁeld to edit the DiSEqC commands sequence (only command Sat A/B in previous ﬁgure), Send/Clear functions and Exit.

To deﬁne the DiSEqC commands sequence press key SHIFT [31] repeatedly until cursor is positioned on one line of the commands sequence (the line will blink). If cursor has been placed on the ﬁrst empty line, Sat A/B command will appear (ﬁrst DiSEqC command of table

3). To select a different command press keys [6] until the desired command appears and then press key ENTER [5].

Some DiSEqC commands need to deﬁne an associated parameter (i.e. On/Off, a numerical value, A/B...), when any of these commands is selected ﬁrst option for the associated parameter appears automatically at its right, to change it press keys [6] and to validate it

press key ENTER [5] (see DiSEqC commands table).

Once the DiSEqC command is deﬁned, the cursor will pass to the following line, if you want to deﬁne a new command proceed as for the ﬁrst one, if you do not want to add any command press key SHIFT [31].

After the commands sequence is created it is possible to modify it. To modify the sequence press key SHIFT [31] repeatedly until you have positioned the cursor on the command you want to make the change and then press key ENTER [5]: Insert function will appear on the

screen, by pressing keys [6] it is possible to select Delete and Edit functions. Once the desired function appears on the screen (Insert, Delete or Edit) press ENTER [5].If you select Delete function the command will be removed from the sequence, if you select Insert or Edit functions, you must deﬁne the new command as previously described.

Once commands sequence is deﬁned, to send it to the peripherals press key SHIFT [31] repeatedly until you have selected the Send function and then press key ENTER [5]. At the same time as DiSEqC commands are sent these appear on the lower side of the monitor. If

Send function does not appear on the monitor, place the cursor over the Clear function and press keys [6].

It is possible to delete the whole of the commands sequence, to do this press key SHIFT [31] repeatedly until you have selected the Clear ﬁeld and then press key ENTER [5]. If Clear function does not appear on the monitor, place the cursor over the Send function and press keys

[6]. To exit DiSEqC function place the cursor over the Exit ﬁeld and then press key ENTER [5]. REMARK: When disconnecting the unit, the commands sequence will NOT be lost. Next table shows the DiSEqC commands available:

DiSEqC 1.2

Sat A/B A

.......................... ....

Page: 1/1 Send Exit

(*)

DiSEqC™ is a trademark of EUTELSAT.

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Tabla 3.- DiSEqC commands.

4.9.2.18.- Beep

This function allows the user to switch the audible indicator ON and OFF. To do this, ﬁrst select the TV mode functions menu, then

choose the Beep function using the keys [6] and press key ENTER [5]. The monitor will show the BEEP screen and by pressing keys

[6] it will be possible to select between Beep ON or Beep OFF. To validate press key ENTER [5] again.

4.9.2.19.- Equipment Information

This function displays information on the instrument. To activate it, press key ENTER [5], while in the TV operation mode. Press keys

[6] to select the Equipment Info. function and press key ENTER [5]. The monitor will show the EQUIPMENT INFO. screen listing

several informations such as the instrument serial number (Serial Number), the version of the control program (Version), etc.

To exit the function press key ENTER [5].

4.9.2.20.- Exit

Exits from the TV functions menu.

Character Command Associated parameter

General Sat A/B A/B

Reset --Power ON --Standby ---

Destined L.O. frequency High/Low

Switch H/V polarisation H/V

Position A/B A/B Sw. option A/B A/B

Non-destined Switch 1 A/B

Switch Switch 2 A/B

Switch 3 A/B Switch 4 A/B

Positioner Halt ---

Disable limits --Enable limits Limit East --Limit West --Drive E. seconds 1 to 127 Drive E. steps 1 to 128 Drive W. seconds 1 to 127 Drive W. steps 1 to 128 Store position 1 to 255 Goto position 1 to 255

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4.10.- Spectrum Analyser Operating Mode

The Spectrum Analyser mode allows the user to discover the signals present in the frequency band in quickly and easily and to make

measurements at the same time. To select it press key SPECT [21]. The monitor will show a picture like the one described in the next ﬁgure.

Figure 17.- Spectrum Analyser mode.

The horizontal lines deﬁne the signal level, the broken lines being 5 dB from the solid ones. The level of the top line (80 dBµV in previous

ﬁgure), named the Reference Level, can be altered using the Reference level function in the Spectrum Analyser mode functions menu (section 4.10.1.3).

The signal level for each frequency is displayed vertically, the lower frequencies appearing at the left of the screen and the higher ones at

the right. The amplitude of the lobes is calibrated. In the example in previous ﬁgure the noise level is at around 37 dBµV and the lobe with the highest signal level (second from the left) is at 64 dBµV.

The frequency range displayed (called span from hereon) can also be altered using the Spectrum Analyser mode functions menu. A vertical broken line, called marker, appears on the spectrum display to identify the tuned frequency. One of the applications of the MTD 120 operating as Spectrum Analyser is in the search for the best orientation and position of the

receiving antenna. This is particularly important in UHF. Because such frequencies are involved, with wavelengths ranging from 35 cm to 65 cm, if the antenna is shifted only a few centimetres, the relationship between the picture, chrominance and sound carrier frequencies change, affecting the quality of the picture in the receiver.

If there is an excess of sound carrier, tearing or 'moiré' may appear on the screen due to the frequency beats between the sound,

chrominance and the picture frequencies.

If there is a chrominance carrier defect, then the television colour ampliﬁer must function at maximum gain, which could result in noise

appearing all over the television screen with points of colour that disappear when the saturation control is reduced; in an extreme case, loss of colour may occur.

4.10.1.- Spectrum Analyser Mode Functions Menu

In the Spectrum Analyser operation mode, pressing key ENTER [5] leads you to the next functions menu.

Figure 18.- Spectrum Analyser mode functions menu.

When press key [6] active option moves upwards while press key [6] active option moves downwards. The downward pointing arrow at the bottom left of the menu means that there are more functions available, to view these press key

[6]. Below we describe the use of each function and its range of values.

FUNCTIONS

Band switching

Span Reference level Dual marker Sweep Measure bandwidth

1992.0 MHz 56.9 dBuV

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4.10.1.1.- Band Switching

Permits to swicth from terrestrial (5-862 MHz) to satellite band (920-2150 MHz) and vice versa.

4.10.1.2.- Span

This function enables selecting the displayed frequency range in Spectrum Analyser mode between Full (the entire band), 500 MHz, 200

MHz, 100 MHz, 50 MHz, 32 MHz, 16 MHz and 8 MHz (the latter two only in terrestrial bands).

To alter the span, select the functions menu, then press keys [6] to select the Span function and press key ENTER [5]. The

screen will show a window with the spans which can be selected. Press keys [6] to select the required span and activate it by pressing key ENTER [5] again.

In Full mode the measuring ﬁlter bandwidth used to display the spectrum is always 1 MHz for terrestrial bands, and 4 MHz for satellite

band. For the other spans you can select the bandwidth using the Measure Bandwidthfunction on the same functions menu. (See section '4.10.1.10 Bandwidth of the Spectrum Measuring Filter').

4.10.1.3.- Reference Level

The reference level corresponds to the level marked by the top horizontal line appearing on the Spectrum Analyser mode screen. This

function enables the reference level to be deﬁned between 70 and 130 dBµV in 10 dB steps. The default reference level is 70 dBµV.

To alter the value of the reference level select the Spectrum Analyser mode functions menu, press keys [6] to select the

Reference level function and press key ENTER [5]. The screen will show a window with the values which can be selected. Press keys

[6] to select the desired reference level and activate it by pressing key ENTER [5] again.

4.10.1.4.- Dual Marker/Single Marker

(Only for level measurements) This function enables two tuning markers (Dual marker) to be seen on the spectrum display. When you

choose this option you can select the active marker (Marker A or Marker B) or return to using only one marker (Single marker).

Figure 19.- Spectrum Analyser mode with two tuning markers.

When you select the Dual marker function, the bottom of the screen displays the frequency of each of the two markers, the signal level

for each frequency and, on the far right, the frequency difference and the level between them.

4.10.1.5.- Sweep

Enables you to choose the sweep speed of the Spectrum mode between High Resolution (slow sweep, high precision) and Fast (fast

sweep, low precision).

To modify the sweep speed select the Spectrum Analyser mode functions menu, then press keys [6] to select the Sweep function

and press key ENTER [5]. The screen will show a window containing all the values which may be chosen. Press keys [6] to select the desired speed and activate it by pressing key ENTER [5] again.

MHz : 1460.8 dBuV : 46.4

1632.0

59.4

171.2

13.0

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4.10.1.6.- Reference Noise

(Only in C/N measurements). Permits to deﬁne the frequency where noise level will be measured. To modify the frequency where you want to measure noise level, accede to the menu functions and select the Reference noise function

then, again in the Spectrum mode, press keys [6] to place the marker on the frequency where you want to measure the noise level or well, press key SHIFT [31], current reference noise frequency will be erased and using the keyboard introduce the new value. Finally accede

to the functions menu again and execute the Carrier function so that you can tune new carrier frequencies by pressing keys [6] .

4.10.1.7.- Channel Bandwidth

(Only in Channel Power measurements). Permits to deﬁne channel bandwidth. To modify the channel bandwidth, that is to say the power integration limits, accede to the menu functions and select the Channel

bandwidth function then, again in the Spectrum mode, press keys [6] to modify it or well press key SHIFT [31], current channel bandwidth will be erased and using the keyboard introduce the new value. Finally accede to the functions menu again and execute the

Marker function so that you can tune new carrier frequencies by pressing keys [6] .

4.10.1.8.- Marker

(Only when measuring Channel power and after deﬁning the Channel bandwidth). Permits to change the tuning frequency by means of

keys [6].

4.10.1.9.- Carrier

(Only when measuring C/N Referenced and after deﬁning the Reference noise). Permits to change the tuning frequency by means of

keys [6].

4.10.1.10.- Bandwidth of the Spectrum Measuring Filter (Measure bandwidth)

The frequency resolution of the Spectrum Analyser mode is determined by the bandwidth of the measuring ﬁlter when displaying the

spectrum. This parameter is fundamental given the increasing density of channels present in all TV transmission systems.

To alter the bandwidth of measurement select the Spectrum Analyser functions menu, then press keys [6] to select the Measure

bandwidth function and press key ENTER [5]. The screen will show a window displaying the values which can be selected. Pressing keys

[6] to select the chosen bandwidth and activate it by pressing key ENTER [5] again. The choice of bandwidth is:

Terrestrial channels: 230 kHz or 1 MHz Satellite channels: 230 kHz or 4 MHz

Filters with the greatest bandwidth (4 MHz y 1 MHz) allow you to take more stable measurements, as well as being able to distinguish

between analogue and digital carriers. The 4 MHz ﬁlter is ideal for level measurements on the satellite band. The 230 kHz ﬁlter is recommended for measuring terrestrial television, cable television and MMDS signals. It also allows you to identify smaller bandwidth signals such as NICAM sound carriers (terrestrial analogue channels), to detect the beacon signal on VSAT, the separation between the audio FM carrier, and between the stereo sub-carriers in television.

4.10.1.11.- Selecting the Channels Table (Channel set)

See 4.9.2.7 section.

4.10.1.12.- Batteries and External Units Power Supply (Battery & Lnb)

See 4.9.2.3 section.

4.10.1.13.- Exit

Exits from the Spectrum Analyser function menu.

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4.10.2.- Selecting the Measurement Mode

The Spectrum Analyser mode permits to make different measurements at the same time you see the signals present in the band. The

types of measurements available are:

Terrestrial band - Analogue channels:

Level Level measurement of the currently tuned carrier. C/N Video carrier to noise ratio referenced to a noise frequency deﬁ ned by the user through the Reference Noise

function.

Terrestrial band - Digital channels:

Channel power Integration method. It consists of scanning the entire channel, calculating the contribution of each portion of the

spectrum to the whole.

C/N Referenced: Channel level to noise ratio referenced to a noise frequency deﬁned by the user through the Reference

Noise function.

Satellite band - Analogue channels:

Level Level measurement of the currently tuned carrier. C/N Video carrier to noise ratio referenced to a noise frequency deﬁ ned by the user through the Reference Noise

function.

Satellite band - Digital channels

Channel power Integration method. C/N Referenced: Channel level to noise ratio referenced to a noise frequency deﬁned by the user through the Reference

Noise function.

Like in the TV mode, to select the type of measure, press key LEVEL [22], then press keys [6] until desired mode is marked and

ﬁnally press key ENTER [5] or key LEVEL [22] to activate the new measurement mode.

4.10.2.1.- Measuring Carrier Levels (Level)

(Only for analogue channels). When selecting this mode on the lower part of the image appears the tuned frequency (or channel) and the

signal level at this frequency. If dual marker function is selected, tuned frequency and signal level are showed for each one of the markers and, on the far right, the frequency difference and the level between them.

4.10.2.2.- Measuring the Carrier / Noise ratio (C/N Referenced)

The Carrier/Noise ratio in Spectrum mode is always referenced to a noise frequency deﬁned by the user. Imagine a situation like the one shown in the next ﬁgure: a digital channel (8 MHz BW) adjacent to an analogue channel. When measuring

C/N for the digital channel in TV mode using the Auto setup, the analogue channel may interfere in the noise measurement (given that the noise level is measured at f

noise

= f

tuning

- 1/2 Channel BW= 650 MHz - 4 MHz = 646 MHz) so under this situation it is recommended to make the measurement in Spectrum Analyser mode and to deﬁne manually the frequency where we want to measure noise (obviously a frequency where no signal is present); i.e. in the next ﬁgure noise is deﬁned to be measured at 655 MHz.

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Figure 20.- Carrier to Noise measurement in Spectrum mode (digital channel).

To deﬁne the frequency to measure the noise, select the Reference noise function in the Spectrum functions menu and press key

ENTER [5]. Next, again in the Spectrum mode, press keys [6] to place the marker on the frequency where you want to measure noise level or press key SHIFT [31], current reference noise value will be erased and using the keyboard introduce the new value. Finally accede to

the functions menu again and execute the Carrier function so that you can tune new carrier frequencies by keys [6].

When C/N measuring mode is selected, on the lower part of the image appears the tuned frequency/channel (Carr.), the noise frequency

(Noise), the carrier Level (if analogue mode is selected) or the channel Power (if digital mode is selected) and the carrier to noise ratio (C/N).

4.10.2.3.- Measuring the Power of Digital Channels (Channel Power)

In the Spectrum Analyser mode the MTD 120 measures digital channel power using an Integration method between channel limits which are deﬁned by the user. To show the interest of this method, imagine a spectral distribution like the one shown in the following ﬁgure (channel bandwidth is 8 MHz deﬁned by the markers). If channel power is measured in TV operation mode different readouts will be obtained depending on the tuned frequency (measurement ﬁlter bandwidth is 230 kHz), if tuning is shifted from 759 MHz to 762 MHz reading will increase in several dB.

Figure 21.- Channel power measurement in Spectrum Mode.

When measuring Channel power, on the lower part of the image appears the tuned frequency (or channel), the channel bandwidth (Channel BW) and the Channel Power.

To measure the channel power, ﬁrst of all it is necessary to deﬁne channel bandwidth, that is to say to set the limits of the integration: select the Channel bandwidth function in the functions menu and then, again in the Spectrum mode, press keys [6] to modify it or

well press key SHIFT [31], current channel bandwidth will be erased and using the keyboard introduce the new value. Finally accede to the functions menu again and execute the Marker function in order you can tune new carrier frequencies, then when pressing keys [6],

the tuning marker and the channel bandwidth limits will shift together.

760.00 MHz Channel Power:

Channel BW: 8.00 MHz

55.0 dBuV

Channel bandwidth

Marker

Carr.: 650.00 MHz Power: 44.0 dBuV

Noise: 655.0 MHz

C/N: 12 dB

Channel BW

Carrier

Reference noise

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IMPORTANT REMARK

To measure digital channels power correctly it is indispensable to tune channel at its central frequency and to deﬁne channel bandwidth.

4.11.- Selecting the Sound Mode (Sound)

From the TV operating mode, analogue mode, press key SOUND [26]. The screen will show the SOUND menu with the types of sound available. Pressing keys [6] choose the type of sound you wish and then press key SOUND [26] or the key ENTER [5] to activate it.

Table 4 shows the different options for the sound mode.

Table 4.- Sound modes.

When you select the NTUN (continuous tuning using a narrow detection ﬁlter) and BTUN (continuous tuning using a broad detection ﬁlter) options the screen displays a window showing the frequency deviation of the sound carrier, this is variable between 4.00 MHz and 9.00

MHz. To deﬁne it press keys [6] to select the desired frequency deviation and press key ENTER [5] to validate.

When the LV function is selected, the speaker of the MTD 120 permits a tone whose frequency depends on the level of the signal received. This is very useful when installing antennas, since the user can locate the peak signal without having to look continually at the monitor of the level meter.

When the NICAM option is selected, it is possible to measure the Bit Error Rate of the modulation. To obtain this measurement, from the TV operating mode, level measurement, press key MONITOR [1] in order to activate the mode of maximum measurement information displayed on the screen (name assigned to memory, power supply to external units, sound, colour system, TV standard, level and frequency/channel). In the position relative to the type of Sound will appear the information about the type of NICAM according to:

Sound: Type + Error

Type = NICAM type:

"- -": no NICAM is detected

"du": dual NICAM

"st": stereo NICAM

"mo": mono NICAM Error = indication of the bit error rate:

I": error rate < 1e-5

"E5": 1e-5 < error rate < 1e-4

"E4": 1e-4 < error rate < 1e-3

"E3": 1e-3 < error rate < 2.7 e-3

"E ^I": error rate > 2.7 e-3

Therefore, for example, the indication Sound: duE

I has to be interpreted as NICAM sound is selected, the detected NICAM is dual and

Type Function Band

4.50 Sound carrier 4.5 MHz above the picture carrier Terrestrial

5.50 Sound carrier 5.5 MHz above the picture carrier Terrestrial

5.74 Selects the second carrier in DUAL or STEREO transmissions, Terrestrial at 5.74 MHz of the picture carrier

5.80 Sound carrier 5.8 MHz above the picture carrier Satellite

6.00 Sound carrier 6.0 MHz above the picture carrier Terrestrial

6.50 Sound carrier 6.5 MHz above the picture carrier Terrestrial

Satellite

6.65 Sound carrier 6.65 MHz above the picture carrier Satellite

7.02 Sound carrier 7.02 MHz above the picture carrier Satellite

NTUN Continuous tuning (4.00 - 9.00 MHz) with narrow sound detection ﬁlter Terrestrial

(110 kHz) Satellite

BTUN Continuous tuning (4.00 - 9.00 MHz) with broad sound detection ﬁlter Terrestrial

(240 kHz) Satellite

NICA NICAM decoding Terrestrial

AM AM demodulation Terrestrial FM FM demodulation Terrestrial

LV Tone whose frequency varies with the signal level Terrestrial

Satellite

OFF Suppresses the sound Terrestrial

Satellite

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the error rate is below 1 e-5.

4.12.- Measurement Conﬁguration Memories

To facilitate measurement, the MTD 120 is able to store up to 99 conﬁgurations in an internal memory. In this way, it is possible to select

the most common transmissions in a work area with their corresponding conﬁgurations quickly and easily.

The following parameters are stored in each conﬁguration: the name assigned to the conﬁguration, frequency or channel number, TV

system, type of measurement, external units supply voltage (VLNB), measurement units and sound parameters.

The different measuring conﬁgurations can be retrieved with the Data logger function, in order to conduct different data acquisitions in a

completely automatic way and store them in the memory for later print-out or processing (see paragraph '4.9.2.4 Data logger function').

4.12.1.- Storing a Measurement Conﬁguration (STORE)

The process of storing a measurement conﬁguration is the following:

1. Select the conﬁguration you want on the MTD 120 (freq./channel, band, etc.).

2. Press key MEMORY [25] until the monitor displays the STORE screen. Check the conﬁguration parameters. Then press keys [6], to select the memory number that you wish to store the conﬁguration in (from 1 to 99). This number corresponds to the column headings of the Data Logger function.

If a conﬁguration is stored in a memory location already containing information, that data will be lost.

3. (Optional) If you wish to assign a name to a memory position press key SHIFT [31], the ﬁrst character of the name will blink, press keys

[6] and the different characters will appear in the ﬁrst position of the conﬁguration name. When you have chosen the ﬁrst character press key ENTER [5], to automatically move on to the second character. Repeat the process for a maximum of four characters.

Figure 22.- STORE screen, storing a measuring conﬁguration.

4. Finally, press key MEMORY [25] or the key ENTER [5] and the conﬁguration will be stored. If any other key is pressed, an error will be indicated and the memory will not be updated.

4.12.2.- Retrieving a Conﬁguration (RECALL)

Press key MEMORY [25]. The screen RECALL will appear on the monitor which shows the different parameters of each measuring

conﬁguration stored. Pressing keys [6], select the conﬁguration to be retrieved (a number between 1 and 99).

Pressing the key MEMORY [25] again or the key ENTER [5] will retrieve the conﬁguration.

Figure 23.- RECALL screen, retrieving a measurement conﬁguration.

RECALL: C33 1

Channel = 23 (CCIR ) TV Sys = PAL-B/G Meas = Lv V Lnb = External Units = dBuV Sound = 5.50

STORE: PM01 1

Channel = 23 (CCIR ) TV Sys = PAL-B/G Meas = Lv V Lnb = External Units = dBuV Sound = 5.50

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4.13.- Direct Access to Functions

Keys FA [28] and FB [29] give direct access to any of the functions on the TV and Spectrum Analyser mode functions menus. To establish a relationship between the direct access key and a function, access the functions menu, select the function you wish to access directly and press key FA [28] or FB [29]. From then on when you press key FA [28] or FB [29] the function will be accessed directly.

4.14.- Printing Measurements and Memories

By connecting the instrument to a serial printer it is possible to obtain a printed report of a sequence of measurements just at the moment they are taken, or later, if they are recorded with the Data logger function. This enables the user to keep a ﬁle about the state of the system and provide the documents related to the level measurements for analysis purposes.

The installation process consists of simply using the data transfer cable to connect the printer to the RS-232C connector [37] on the MTD 120 (see section '4.14.1 Handshake and control lines'). Switch off the power to both instruments before connecting.

To print measurements select the Data logger function on the functions menu (see section '4.9.2.4 Data Logger function'), access the conﬁguration menu, activate the print ﬁeld (Print: On) and switch on the printer. From now on the printing process is equivalent to taking measurements.

The following ﬁgure shows an example of printing two activated columns (memories 1 PM01 and 2 PM02) and two activated rows (test points 1 and 2).

Figure 24.- Printing measurements.

LOCATION: SIGNATURE:

DATE: 01/01/1999 TIME: 08.54.00 TEST POINT: 1

< 1> PM01 Ch 23 Meas.: Lv Frequency: 487.25 MHz Level: 69 dBuV

< 2> PM02 Ch -Meas.: Lv Frequency: 621.25 MHz Level: 75 dBuV

DATE: 01/01/1999 TIME: 08.55.00 TEST POINT: 2

< 1> PM01 Ch 23 Meas.: Lv Frequency: 487.25 MHz Level: 70 dBuV

< 2> PM02 Ch -Meas.: Lv Frequency: 621.25 MHz Level: 74 dBuV

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4.14.1.- Handshake and Control Lines

Next is described the handshake and control lines used by the MTD 120:

- The following parameters are used for printing through the serial port:

Rate: 19.200 bauds Data bits: 8 bits Parity: No Stop bits: 1

- The control lines used are:

- DATA TRANSMIT (pin 3 MTD 120): To send data to the printer.

- CLEAR TO SEND (pin 8 MTD 120): Data transfer control. Data are sent only when this line is active.

- DATA TERMINAL READY (pin 4 MTD 120): This line is permanently active in order to indicate the establishment of the communication.

Connections

The cable between the MTD 120 and the printer must have the following connections:

Figure 25.- Connector RS-232C MTD 120. Pins numbering.

12345

6789

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PC CONNECTOR LEVEL METER CONNECTOR

Type D-25, female Type D-9, female SHIELD GROUND 1

DATA TRANSMIT 2 2 DATA RECEIVE DATA RECEIVE 3 3 DATA TRANSMIT REQUEST TO SEND 4 1 CARRIER DETECT CTS 5 4 DATA TERM. READY DATA SET READY 6 GROUND 7 5 GROUND CARRIER DETECT 8 7 REQUEST TO SEND DATA TERMINAL READY 20 6 DATA SEND READY

8 CLEAR TO SEND

RING INDICATOR 22 9 RING INDICATOR

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5.- BER MEASUREMENT OF QPSK & QAM MODULATED SIGNALS

5.1.- Description

By means of the options BER measurement for DVB-Satellite (QPSK modulation), DVB-Cable signals (QAM modulation) and DVBTerrestrial (COFDM modulation), it is possible to make Bit Error Rate measurements on digital signals. Besides, these options incorporate the DCI function (DVB Channels Identiﬁer) which provides information on the tuned channel, in this way it is possible to identify it with total certainty with no need to decode the digital signal.

5.2.- BER measurement mode selection

To select the BER measurement mode:

1) Select the TV operating mode. If present operating mode is the spectrum analyser mode press key SPECT [21].

2) Select the terrestrial band for the measurement of QAM or COFDM modulated signals or the satellite band for the measurement of QPSK modulated signals.

QAM signals 47 MHz to 862 MHz QPSK signals 950 MHz to 2150 MHz COFDM signals 470 to 862 MHz

3) Select the DIGITAL operating mode by means of the key A/D [20].

4) Select the BER measurement mode: to do this press key LEVEL [22], press keys [6] to select the BER measuring mode, next, to activate it press key ENTER [5] or key LEVEL [22].

5.3.- QAM modulation

Before to measure the BER it is necessary to deﬁne some parameters concerning the digital signal, which are described next. To see its present value or to modify it, being in the BER measuring screen, press key ENTER [5], a multiple-choice menu showing the functions relative to the BER measurement will appear on the screen:

1) Modulations It deﬁnes the modulation type. When selecting this function and pressing key ENTER [5], a multiple-choice menu will appear on the

screen, this menu permits to choose one of the following modulations: 16, 32, 64, 128 and 256.

2) Symbol Rate When selecting this function and pressing key ENTER [5], a multiple-choice menu will appear on the screen, this menu permits to choose

one of the following values: 6875, 6111, 5000, 4443, 1528, 1500, 1408, 1333, 1266, 1000 kbauds, or well to deﬁne any other value by means of the Other option.

When selecting the Other option, a screen titled QAM SYMBOL RATE will appear, this screen shows present Symbol Rate value, to modify it press key SHIFT [31], enter the new value (four ﬁgures) and ﬁnally press key ENTER [5] to activate it.

3) Spectral Inv. If necessary, activate the Spectral inversion. If the spectral inversion is not correctly selected, reception will not be correct.

4) Attenuator It permits to select attenuation between 0 and 30 dB. It is advisable to activate the 30 dB attenuator under that measurement conditions

where the signal level is near to the maximum input level (approximately starting from 20 dB under the maximum level) and it is possible that the tuner becomes saturated. Under no-saturation conditions, when increasing the attenuation value the BER measure must to maintain or to increase (insufﬁcient signal level) but never to decrease.

Once you have deﬁned the QAM signal parameters, it will be possible to measure the BER. When the BER measuring mode is selected, the monitor will show a picture like the following:

Figure 26.- BER measuring screen for QAM modulated signals.

QAM 1.0E-5

BER before FEC

-8 -7 -6 -5 QEF -3 -2 Freq: 800.00 MHz + 1.2kHz W.P. 0 in 00:22:59 MPEG-2

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First of all it is shown the BER before FEC (Forward Error Correction). In a digital reception system for cable signals, after the QAM decoder an error correction method called Reed-Solomon is applied (see

ﬁgure 27). Obviously, the error rate after the corrector is lower to the error rate at the QAM decoder output. This is the reason because this screen provides the BER measurement before FEC (Forward Error Correction) and the number of non correctable errors (W.P., Wrong Packets) received after Reed-Solomon in the measuring time.

Figure 27.- Digital reception system via cable.

The BER measurement is provided in scientiﬁc notation (i.e. 1.0 E-5 means 1.0x10

-5

that is to say one wrong bit of every 100,000) and through an analogue bar (as its length is smaller the signal quality will be better). The analogue representation is done on a logarithmic scale (not linear).

With the aim to have a reference about the signal quality, it is considered that a system has a good quality when it decodes less than one non-correctable error for every transmission hour. This border is known as QEF (Quasi-Error-Free) and it corresponds approximately to a BER before FEC of 2.0E-4 BER (2.0x10

-4

, that is to say two incorrect bits of every 10,000). This value is marked on the measurement bar of

the BER and therefore, BER for acceptable signals must be at theleft side of this mark.

Below the BER analogue bar it is shown the tuned frequency (or channel) and the frequency deviation in kHz between the tuned frequency and the one which optimizes the BER (i.e. 800.00 MHz + 1.2 kHz).

In the next line it is shown the number of non corrigible packets received 'wrong packets' (up to a maximum of 126) in the time detailed on its right. A packet is considered wrong when one, at least, non corrigible bit is detected. To reset this measurement just modify the measurement conditions: for example change the tuned frequency.

Finally it is shown a status line which displays information about the detected signal. The possible messages that can appear and its meaning are shown in the following list. The messages are exposed from less to more fulﬁlment of the MPEG-2 standard:

No signal received

Any signal has been detected.

Signal received

A signal is detected but it can not be decoded.

Carrier recovered

A digital carrier has been detected but it can not be decoded.

MPEG-2

Correct detection of a MPEG-2 signal. The BER is showed.

In case of detecting a DVB signal, message MPEG-2 DVB-C will appear and the DVB Channel Identiﬁer function will be autoatically activated. See section 5.4.1 DVB Channel Identiﬁer.

IMPORTANT REMARK

DVB-C channels tuning may require an adjusting process. It is recommended to follow next procedure:

1.- From the spectrum analyser mode, tune the channel at its central frequency.

2.- Switch to TV mode, BER measuring mode.

3.- If in the lower line of the screen does not appear MPEG-2 message (and consequently BER is unacceptable), by pressing keys [6] deviate the tuning frequency until MPEG-2 message appears. Finally tune channel again to minimize the frequency

deviation which optimizes the BER and therefore minimize the BER.

If it is not possible to detect any MPEG-2 channel, make sure that digital signal parameters are correctly deﬁned and if signal level is too

low, check that the 30 dB attenuator is not activated (Attenuator 0 dB).

TUNER

QAM

DEMOD.

A/D

REED-

SOLOMON

BER before FEC Wrong packets

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5.4.- QPSK modulation

1) Code Rate Also known as Viterbi ratio. It deﬁnes the ratio between the number of data bits and actual transmission bits (the difference corresponds to

the control bits for error detection and correction). It permits to choose between 1/2, 2/3, 3/4, 4/5, 5/6, 6/7, 7/8, 8/9 and Auto. If Code Rate parameter is not known it is possible to assign the Auto option.

2) Symbol Rate It is possible to choose between the following values: 30000, 27500, 22000, 20000, 19995, 6110, 6000, 5998, 5632, 5062, 4340, 4000

kbauds, or well to deﬁne any other value (Other). When selecting the Other option, a screen titled Q PSK SYMBOL RATE will appear. This screen shows present value, to modify it press key SHIFT [31] and enter the new value through the keyboard. The unit accepts any number with 5 ﬁgures between 2000 and 35000 kbauds (ﬁfth ﬁgure acts as validation). For example, to select a symbol rate of 8200 kbauds it must be entered: 08200.

3) Spectral Inv. Finally, if necessary, activate the Spectral inversion. The Auto mode permits to automate this selection except for the following Code

Rate: 4/5, 5/6, 6/7 and 8/9. If the spectral inversion is not correctly selected, reception will not be correct.

4) Attenuator It permits to select attenuation between 0 and 30 dB. It is advisable to activate the 30 dB attenuator under that measurement conditions

Once you have deﬁned the QPSK signal parameters, it will be possible to measure the BER. When the BER measuring mode is selected, the monitor will show a picture like the following:

Figure 28.- BER measuring screen for QPSK modulated signals.

Two BER measurements are shown:

1) BER before FEC (Forward Error Corrections)

2) BER after Viterbi In a digital reception system for satellite signals, after the QPSK decoder two different correction methods are applied (see ﬁgure 29).

Obviously, each time we apply an error corrector to a digital signal, the error rate changes, therefore if we measure in a digital satellite television system, for example, the error rate at the output of the QPSK demodulator, at the output of the Viterbi decoder, and at the output of the Reed-Solomon decoder, we obtain nothing more than different error rates. This is the reason because the BER measurement is provided before FEC, after Viterbi and the number of non correctable errors (W.P. - wrong packets-) received after Reed-Solomon for the measuring time.

Figure 29.- Digital reception system via satellite.

TUNER

QPSK

DEMOD.

DUAL A/D

VITERBI

REED-

SOLOMON

BER before FEC BER after Viterbi Wrong packets

QPSK 1.0E-7

BER before FEC: 2.0E-3

-6 -5 -4 -3 -2 -1 BER after Viterbi: 2.0E-3

-8 -7 -6 -5 QEF -3 -2 Freq: 1777.0 + 1.2 MHz W.P. 0 in 00:22:59 MPEG-2

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The BER measurement is provided in scientiﬁc notation (i.e. 2.0 E-3 means 2.0x10-3, that is to say two incorrect bits of every 1,000) and

through an analogue bar (as its length is smaller the signal quality will be better). The analogue representation is done on a logarithmic scale (not linear).

With the aim to have a reference about the signal quality, it is considered that a system has a good quality when it decodes less than one

non-correctable error for every transmission hour. This border is known as QEF (Quasi-Error-Free) and it corresponds approximately to a BER after Viterbi of 2.0E-4 BER (2.0x10

-4

). This value is marked on the measurement bar of the BER after Viterbi and therefore, BER for

acceptable signals must be at the left side of this mark.

Next it is shown the tuning frequency and the frequency deviation in MHz between the tuned frequency and the one which optimizes the

BER (i.e. Freq: 1777.0 +1.2 MHz).

Next it is shown the number of non corrigible packets received W.P. -wrong packets- (up to a maximum of 126) in the time detailed on its

right. A packet is considered wrong when a bit is received incorrectly. To reset this measurement just modify the measurement conditions: for example change the tuning frequency.

Finally it is shown a status line with information about the detected signal. The possible messages that can appear and its meaning are

shown in the following list. The messages are exposed from less to more fulﬁlment of the MPEG-2 standard:

No signal received

Any signal has been detected.

Signal received

A signal is detected but it can not be decoded.

Carrier recovered

A digital carrier has been detected but it can not be decoded.

Viterbi synchronized

A digital carrier has been detected and the Viterbi algorithm is synchronized, but too many frames arrive with non correctable errors. It is not possible to quantify the BER.

MPEG-2

Correct detection of a MPEG-2 signal. In case of detecting a DVB signal, message MPEG-2 DVB-S will appear and the DVB Channel Identiﬁer function will be automatically

activated. See section 5.4.1 DVB Channel Identiﬁer.

IMPORTANT REMARK

DVB-S channels tuning may require an adjusting process. It is recommended to follow next procedure:

1.- From the spectrum analyser mode, tune the channel at its central frequency.

2.- Switch to TV mode, BER measuring mode.

3.- If in the lower line of the screen does not appear MPEG-2 message (and consequently BER is unacceptable), by pressing keys

[6] deviate the tuning frequency until MPEG-2 message appears. Finally tune again channel to minimize the frequency

deviation which optimizes the BER and therefore minimize the BER.

If it is not possible to detect any MPEG-2 channel, make sure that digital signal parameters are correctly deﬁned and if signal level is too

low, check that the 30 dB attenuator is not activated (Attenuator 0 dB).

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5.5.- COFDM modulation

Before to measure the BER it is necessary to deﬁne some parameters concerning the digital signal, which are described next. To see its

present value or to modify it, being in the BER measuring screen, press the ENTER [5] key, a multiple-choice menu showing the functions relative to the BER measurement will appear. The parameters that must be deﬁned by the user are the following:

1) Carriers It deﬁnes the number of modulation carriers between 2k and 8k. To modify its value, place the marker over the Carriers ﬁeld by pressing

keys [6] and then press ENTER [5] key: a menu will appear on the screen. With keys [6] select the desired value for the Carriers parameter and ﬁnally press ENTER [5] key again to validate.

2) Guard interval The Guard Interval parameter corresponds to the time between symbols, its purpose is to permit a correct detection in multi-path situa-

tions. This parameter is deﬁned according to the symbol length: 1/4, 1/8, 1/16, 1/32. To modify its value, press keys [6] and place the marker over the Guard Interval ﬁeld and then press ENTER [5] key: a menu with the available values will appear. Then pressing keys

[6] select the desired value and ﬁnally press ENTER[5] key to validate.

3) Attenuator It permits to select attenuation between 0 and 30 dB. It is advisable to activate the 30 dB attenuator under that measurement conditions

This conﬁguration menu shows, besides the user deﬁnable COFDM signal parameters, the value of the rest of COFDM signal parameters detected automatically:

Code Rate Also known as Viterbi ratio, deﬁnes the ratio between the data bits number and the total number of bits transmitted (the

difference corresponds to the number of control bits for the error detection and recovery).

Modulations Carriers modulation. It also deﬁnes the system noise immunity. (QPSK, 16-QAM and 64-QAM). Spectral Inv. Deﬁnes the state of the spectral inversion. Hierarchy The DVB-T norm contemplates the possibility to make a DTT transmission with hierarchical levels, it is to say a simul-

taneous transmission of the same program with different image qualities and noise protection levels, in order the receiver decodes the signal in the best conditions.

Once you have deﬁned the COFDM signal parameters, it will be possible to measure the BER. When the BER measuring mode is selec-

ted, the monitor will show a picture like the following:

Figure 30.- COFDM signals BER measuring screen.

Two measures are shown:

1) CSI: Channel status information

2) BER after Viterbi The CSI measure (Channel Status Information) is a qualitative measure about channel state, between 0 and 100%. The optimum value

corresponds to 0%. This measure permits to look for the best situation even in those measuring conditions where the measured BER is best than the minimum readout (in this way, in the example of the previous ﬁgure, the measured BER is lower that the minimum readout, 1.0x10

-7

but the CSI measurement, 27%, still can be improved).

Next it is shown the BER after Viterbi measurement both in numeric and graphic bar format. In a reception system of terrestrial digital signal, after the COFDM decoder two error correction methods are applied. Obviously, each time

we apply an error corrector to the digital signal, the error rate changes, therefore if we measure the error rate at the output of the COFDM demodulator, at the output of the Viterbi decoder, and at the output of the Reed-Solomon decoder, we obtain nothing more than different error rates. This is the reason because of the QPSK-COFDM option provide the BER after Viterbi and the number of Wrong packets received after Reed- Solomon.

COFDM 1.0E-7

CSI: 27%

0 25 50 75 100 BER after Viterbi:

-7 -6 -5 QEF -3 -2 -1 Chan: 67 W.P. 0 in 00:22:59 MPEG-2 DVB-T

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Figure 31.- COFDM reception system.

The BER measurement is provided in scientiﬁc notation (i.e. 3.1 E-7 means 3.1x10

-7

, that is to say 3.1 wrong bits of each 10000000) and through a graphic bar (as its length is smaller the signal quality will be better). The analogue representation is done on a logarithmic scale (not linear), that is to say, the bar divisions correspond to the exponent of the measurement.

With the aim to have a reference about the signal quality, it is considered that a system has a good quality when it decodes less than one non-correctable error for every transmission hour. This border is known as QEF (QUASI-ERROR-FREE) and it corresponds approximately to a BER after Viterbi of 2.0E-4 BER (2.0x10

-4

, that is to say 2 wrong bits of each 10000). This value is marked on the measurement bar of the

BER and therefore, BER for acceptable signals must be at the left side of this mark.

In the lower line of the screen it appears the W. P. counter (Wrong Packets counter). This counter shows the number of wrong packets received after Reed-Solomon during the measuring time. This counter is automatically activated when the unit detects an MPEG-2 signal.

If at any time, the received signal stops to satisfy the requirements of the MPEG-2 standard, this counter will deactivate, that is to say it will keep the number of wrong packets received and the measuring time, later, if an MPEG-2 signal is received again, it will activate with no reset.

When during any measuring time interval the counter has been deactivated, in other words the signal has not satisﬁed the MPEG-2 requirements, the presentation of this counter will alternate with another counter titled FAIL. This second counter shows the time that the detected signal has not fulﬁlled the MPEG-2 standard requirements (12 seconds in the example of the following ﬁgure) and the number of signal cuts (2 in the example of the following ﬁgure). To reset the counter it is necessary to change any of the detection parameters, for example tune again the signal or push twice the LEVEL [22] key.

Figure 32.- Signalling two MPEG-2 signal cuts with a total length of 12 seconds.

Finally it is shown a status line with information about the detected signal. The possible messages that can appear and its meaning are showing the following list. The messages are exposed from less to more fulﬁlment of the MPEG-2 standard:

No signal received

No signal has been detected.

Timing recovered

Only it is possible to recuperate the symbol time.

AFC in lock

The system automatic frequency control can identify and lock a digital transmission (DTT) but its parameters can not be obtained. It can

be due to a transitory situation previous to the TPS identiﬁcation (Transmission Parameter Signalling) or well to a DTT transmission with

an insufﬁcient C/N ratio.

COFDM 1.0E-7

CSI: 27%

0 25 50 75 100 BER after Viterbi:

-7 -6 -5 QEF -3 -2 -1 Chan: 67 FAIL 00:00:12 ( 2) MPEG-2 DVB-T

TUNER

COFDM

DEMOD.

A/D

VITERBI

REED-

SOLOMON

BER after Viterbi Wrong packets

146

TV & SAT Level Meter MTD 120 User Manual

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147

ENGLISH

TV & SAT Level Meter MTD 120 User Manual

TPS in lock

The TPS (Transmission Parameter Signalling) are decoded. The TPS are carriers (17 in the 2k system and 68 in the 8k system) modula-

ted in DBPSK, containing information related to the transmission, modulation and codiﬁcation: Modulation type (QPSK, 16-QAM, 64-

QAM), Hierarchy, Guard Interval, Viterbi Code Rate, Transmission mode (2k or 8k) and Number of the received frame.

MPEG-2

Correct detection of a MPEG-2 signal.

In case of detecting a DVB signal, message MPEG-2 DVB-T will appear and the DVB Channel Identiﬁer function will be automatically activated. See section 5.6. DVB Channel Identiﬁer.

Page 47

5.6.- DVB Channels Identiﬁer: DCI function

This function permits to identify DVB channels with no need to have a digital signal decoder which permits to see transmitted TV channels.

The DVB group recommends to digital TV service operators the codiﬁcation on the Transport Stream of some particular ﬁelds containing data information. The Transport Stream is a sequence of packets, of constant length, which carry video or audio information or data.

Data packets can be grouped to constitute TABLES, some of these tables content information deﬁned by the network operator and which show the type of service that is being supplied to the users. Among the different data deﬁned in these tables, the most frequently used data for channel identiﬁcation purposes are:

Network It contents the name given to the set of all the Transport Stream managed inside the same communication channel.

Bouquet It contents the name given to the set of all the services commercialized as one entity.

Service It contents the names of services that, under the control of one operator, can be shown at each moment on the

Transport Stream, as a function of current programming.

In case the operator includes this information, the three ﬁelds are not transmitted at the same time but they appear alternatively in different packets. Besides, the cadence of presentation of each one of these packets may vary from one operator to another.

When tuning a DVB compatible transponder, the DCI function (DVB Channels Identiﬁer) detects those data packets including service information relative to these three ﬁelds and shows on the lower line on the screen the information contained in them automatically.

Figure 33.- DCI function. In this example the information coded by the operator on the

Service and Network ﬁelds is the same.

The information that appears in the Network, Bouquet and Service ﬁelds is responsibility of the Operator in charge

of the tuned transponder. The MTD 120 only decodes this information, if it is present, and shows it on the screen.

QPSK 1.0E-7

BER before FEC: 1.0E-3

-6 -5 -4 -3 -2 -1 BER after Viterbi: 1.0E-7

-8 -7 -6 -5 QEF -3 -2 Freq: 1224.0 - 0,8 MHz W.P. 0 in 00:22:59 MPEG-2 DVB-S

QPSK 1.0E-7

BER before FEC: 1.0E-3

-6 -5 -4 -3 -2 -1 BER after Viterbi: 1.0E-7

-8 -7 -6 -5 QEF -3 -2 Freq: 1224.0 - 0,8 MHz W.P. 0 in 00:23:22 Bouquet: News Bouquet

QPSK 1.0E-7

BER before FEC: 1.0E-3

-6 -5 -4 -3 -2 -1 BER after Viterbi: 1.0E-7

-8 -7 -6 -5 QEF -3 -2 Freq: 1224.0 - 0,8 MHz W.P. 0 in 00:23:15 Network: NetMed

QPSK 1.0E-7

BER before FEC: 1.0E-3

-6 -5 -4 -3 -2 -1 BER after Viterbi: 1.0E-7

-8 -7 -6 -5 QEF -3 -2 Freq: 1224.0 - 0,8 MHz W.P. 0 in 00:23:48 Service: NetMed

148

TV & SAT Level Meter MTD 120 User Manual

Page 48

149

ENGLISH

TV & SAT Level Meter MTD 120 User Manual

6.- DESCRIPTION OF THE INPUTS AND OUTPUTS

6.1.- RF input

The RF input is through the RF [35] connector on the side panel. The peak signal level should never exceed 130 dBµV.

6.2.- RS-232C serial port

The MTD 120 incorporates an RS-232C serial port for data exchange with a PC, a serial printer or to other devices. The signals in this connector are described in Table 5.

Figure 34.- RS-232C connector. External view.

PIN No. SIGNAL CHARACTERISTICS

1 Carrier Detect (not connected)

2 Data Request (RxD)

3 Data Transmit (TxD)

4 Data Transmission Ready (DTR) Fixed at +12 V

5 Ground (GND)

6 Data Send Ready (DSR) (not connected)

7 Request To Send (RTS)

8 Clear To Send (CTS)

9 Ring Indicator (not connected)

Table 5.- Description of the RS-232C connector.

Page 49

6.3.- Scart (DIN EN 50049)

Figure 35.- Scart socket (external view).

Also known as PERITEL connector (in conformity with standard NF-C92250). The signals in this connector are the following:

PIN number

SIGNAL CHARACT. PIN number SIGNAL CHARACT.

1 Right channel audio output 12 Digital bus interface (not connected) 2 Right channel audio input 13 Red grounding (R) 3 Left channel audio output 14 Digital bus reserved (not connected) 4 Audio grounding 15 Red output (R) 5 Blue grounding (B) 16 Blanked signal (not connected) 6 Left channel audio input 17 Composite video grounding 7 Blue output (B) 18 Blanked return (not connected) 8 Switching voltage 19 Composite video output

9 Green grounding (G) 20 Video input 10 Digital bus interface (not connected) 21 Connector shield grounding 11 Green output (G)

Table 6.- Description of the Scart.

201816

1086

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TV & SAT Level Meter MTD 120 User Manual

Page 50

151

ENGLISH

TV & SAT Level Meter MTD 120 User Manual

7.- MAINTENANCE

7.1.- Considerations about the Screen (only ref. 4202)

This paragraph offers key considerations regarding the use of the colour screen, taken from the speciﬁcations of the manufacturer. In the LCD display, the user may ﬁnd pixels that do not light up or pixels that are permanently lit. This should not be regarded as a defect

in the LCD. In accordance with the manufacturer quality standard, 9 pixels with these characteristics are considered admissible.

Pixels which are not detected when the distance from the surface of the LCD screen to the human eye is greater than 35 cm, with a

viewing angle of 90º between the eye and the screen should not be considered manufacturing defects either.

It is advisable a viewing angle of 15º in the 6.00 o'clock direction in order to obtain the optimum visualization of the screen. See following

ﬁgure.

Figure 36.- Optimum viewing of the screen.

7.2.- Internal fuses which user cannot replace

The following fuses are found on the base board. Their location identiﬁer and characteristics are the following:

F4 & F5 5 A F 63 V SMD F3 1 A F 63 V SMD

7.3.- Replacing the Batteries

Batteries must be replaced whenever the capacity of the fully-charged batteries is noticeably diminished. To change the batteries, follow

next procedure:

Figure 37.- Battery compartment.

- Remove the rear holster, if in place.

- The battery compartment is located in the rear panel of the instrument. Remove the 5 securing screws (A) (2 on each side and 1 at the bottom) shown in the previous ﬁgure (here the battery compartment is shown taken out and facing down). Rest the MTD 120 on its rear panel and lift it to free the battery compartment.

- Remove the 2 side screws (C) securing the battery holder (B).

- Disconnect the battery terminals, remove the anti-humidity paper and replace the batteries with two new ones of the same type.

RST

RS-232C

SCART ITF

EXT.

SUPPLY

BATTERY OK CHARGER

EXT VIDEO

DRAIN

MONITOR

SCREEN

A/D

SHIFT

CH/F

SPECT

LEVEL

MODE

SEARCH4MEMORY

LNB

SOUND

Medidor de Campo Color TV&SAT MTD 120

ENTER

15°

Page 51

IMPORTANT

The maximum period of time that the instrument can remain disconnected from the batteries before loosing measurement

conﬁgurations and stored data is 5 minutes.

- Replace the anti-humidity paper and connect the terminals to the new batteries. Remember to maintain the polarity of the terminals:

red-positive, black-negative.

WARNING

Avoid any type of short circuit among the cables connected to the battery, since the resulting high current may cause serious

damage to the instrument.

- Place and secure the battery holder (B) with the two screws (C).

- Insert the battery compartment into the back of the MTD 120 and secure with the ﬁve screws (A).

- If you wish, replace the holster.

7.4.- Cleaning Recommendations

The cover should be cleaned by means of a light solution of detergent and water applied with a soft cloth. Dry thoroughly before using the system again.

CAUTION

Do not use for the cleaning of the front panel and particularly the viewﬁnders, alcohol

or its derivatives, these products can attack the mechanical properties of the materials

and diminish their useful time of life.

CAUTION

To clean the cover, take care the instrument is disconnected.

Do not use scented hydrocarbons or chlorized solvents.

Such products may attack the plastics used in the construction of the cover.

152

TV & SAT Level Meter MTD 120 User Manual

Page 52

ESPAÑOL

FRANÇAIS

ENGLISH

Ch. Freq.

2 48,25 3 55,25 4 62,25 S01 105,25 S02 112,25 S03 119,25 S04 126,25 S05 133,25 S06 140,25 S07 147,25 S08 154,25 S09 161,25 S10 168,25 5 175,25 6 182,25

Ch. Freq.

7 189,25 8 196,25 9 203,25 10 210,25 11 217,25 12 224,25 S11 231,25 S12 238,25 S13 245,25 S14 252,25 S15 259,25 S16 266,25 S17 273,25 S18 280,25 S19 287,25

Ch. Freq.

S20 294,25 S21 303,25 S22 311,25 S23 319,25 S24 327,25 S25 335,25 S26 343,25 S27 351,25 S28 359,25 S29 367,25 S30 375,25 S31 383,25 S32 391,25 S33 399,25 S34 407,25

Ch. Freq.

S35 415,25 S36 423,25 S37 431,25 S38 439,25 S39 447,25 S40 455,25 S41 463,25 21 471,25 22 479,25 23 487,25 24 495,25 25 503,25 26 511,25 27 519,25 28 527,25

Ch. Freq.

29 535,25 30 543,25 31 551,25 32 559,25 33 567,25 34 575,25 35 583,25 36 591,25 37 599,25 38 607,25 39 615,25 40 623,25 41 631,25 42 639,25 43 647,25

Ch. Freq.

44 655,25 45 663,25 46 671,25 47 679,25 48 687,25 49 695,25 50 703,25 51 711,25 52 719,25 53 727,25 54 735,25 55 743,25 56 751,25 57 759,25 58 767,25

Ch. Freq.

59 775,25 60 783,25 61 791,25 62 799,25 63 807,25 64 815,25 65 823,25 66 831,25 67 839,25 68 847,25 69 855,25

MTD 120

153

Ch. Freq.

FA 47,75 FB 55,75 FC1 60,50 FC 63,75 5 176 6 184 7 192 8 200 9 208 10 216 11 224

Ch. Freq.

12 232 13 240 14 288 D01 303,25 D02 315,25 D03 327,25 D04 339,25 D05 351,25 D06 363,25 D07 375,25 D08 387,25

Ch. Freq.

D09 399,25 21 471,25 22 479,25 23 487,25 24 495,25 25 503,25 26 511,25 27 519,25 28 527,25 29 535,25 30 543,25

Ch. Freq.

31 551,25 32 559,25 33 567,25 34 575,25 35 583,25 36 591,25 37 599,25 38 607,25 39 615,25 40 623,25 41 631,25

Ch. Freq.

42 639,25 43 647,25 44 655,25 45 663,25 46 671,25 47 679,25 48 687,25 49 695,25 50 703,25 51 711,25 52 719,25

Ch. Freq.

53 727,25 54 735,25 55 743,25 56 751,25 57 759,25 58 767,25 59 775,25 60 783,25 61 791,25 62 799,25 63 807,25

Ch. Freq.

64 815,25 65 823,25 66 831,25 67 839,25 68 847,25 69 855,25

Ch. Freq.

1 49,75 2 59,25 3 77,25 4 85,25 5 93,25 SK1 111,25 SK2 119,25 SK3 127,25 SK4 135,25 SK5 143,25 SK6 151,25 SK7 159,25 SK8 167,25 6 175,25 7 183,25

Ch. Freq.

8 191,25 9 199,25 10 207,25 11 215,25 12 223,25 SK11 231,25 SK12 239,25 SK13 247,25 SK14 255,25 SK15 263,25 SK16 271,25 SK17 279,25 SK18 287,25 S19 295,25 S20 303,25

Ch. Freq.

S21 311,25 S22 319,25 S23 327,25 S24 335,25 S25 343,25 S26 351,25 S27 359,25 S28 367,25 S29 375,25 S30 383,25 S31 391,25 S32 399,25 S33 407,25 S34 415,25 S35 423,25

Ch. Freq.

S36 431,25 S37 439,25 S38 447,25 S39 455,25 S40 463,25 21 471,25 22 479,25 23 487,25 24 495,25 25 503,25 26 511,25 27 519,25 28 527,25 29 535,25 30 543,25

Ch. Freq.

31 551,25 32 559,25 33 567,25 34 575,25 35 583,25 36 591,25 37 599,25 38 607,25 39 615,25 40 623,25 41 631,25 42 639,25 43 647,25 44 655,25 45 663,25

Ch. Freq.

46 671,25 47 679,25 48 687,25 49 695,25 50 703,25 51 711,25 52 719,25 53 727,25 54 735,25 55 743,25 56 751,25 57 759,25 58 767,25 59 775,25 60 783,25

Ch. Freq.

61 791,25 62 799,25 63 807,25 64 815,25 65 823,25 66 831,25 67 839,25 68 847,25 69 855,25

Ch. Freq.

A02 55,25 A03 61,25 A04 67,25 A05 77,25 A06 83,25 A07 175,25 A08 181,25 A09 187,25 A10 193,25 A11 199,25 A12 205,25

Ch. Freq.

A13 211,25 14 471,25 15 477,25 16 483,25 17 489,25 18 495,25 19 501,25 20 507,25 21 513,25 22 519,25 23 525,25

Ch. Freq.

24 531,25 25 537,25 26 543,25 27 549,25 28 555,25 29 561,25 30 567,25 31 573,25 32 579,25 33 585,25 34 591,25

Ch. Freq.

35 597,25 36 603,25 37 609,25 38 615,25 39 621,25 40 627,25 41 633,25 42 639,25 43 645,25 44 651,25 45 657,25

Ch. Freq.

46 663,25 47 669,25 48 675,25 49 681,25 50 687,25 51 693,25 52 699,25 53 705,25 54 711,25 55 717,25 56 723,25

Ch. Freq.

57 729,25 58 735,25 59 741,25 60 747,25 61 753,25 62 759,25 63 765,25 64 771,25 65 777,25 66 783,25 67 789,25

Ch. Freq.

68 795,25 69 801,25 70 807,25 71 813,25 72 819,25 73 825,25 74 831,25 75 837,25 76 843,25 77 849,25 78 855,25

C C I R

S T D L

O I R T

F C C

APENDICE A .- Tablas Canal - Frecuencia

APPENDICE A: Tables Canal-Fréquence

APPENDIX A: Channel - Frequency tables

Page 53

MTD 120

154

ASTRA-HL

ASTRA-VL

ASTRA-HH

ASTRA-VH

Ch. Freq.

49 10714,25 51 10743,75 53 10773,25 55 10802,75 57 10832,25

Ch. Freq.

59 10861,75 61 10891,25 63 10920,75 33 10964,25 35 10993,75

Ch. Freq.

37 11023,25 39 11052,75 41 11082,25 43 11111,75 45 11141,25

Ch. Freq.

47 11170,75 1 11214,25 3 11243,75 5 11273,25 7 11302,75

Ch. Freq.

9 11332,25 11 11361,75 13 11391,25 15 11420,75 17 11464,25

Ch. Freq.

19 11493.75 21 11523,25 23 11552,75 25 11582,25 27 11611,75

Ch. Freq.

29 11641,25 31 11670,75

Ch. Freq.

50 10729,00 52 10758,50 54 10788,00 56 10817,50 58 10847,00

Ch. Freq.

60 10876,50 62 10906,00 64 10935,50 34 10979,00 36 11008,50

Ch. Freq.

38 11038,00 40 11067,50 42 11097,00 44 11126,50 46 11156,00

Ch. Freq.

48 11185,50 2 11229,00 4 11258,50 6 11288,00 8 11317,50

Ch. Freq.

10 11347,00 12 11376,50 14 11406,00 16 11435,50 18 11479,00

Ch. Freq.

20 11508,50 22 11538,00 24 11567,50 26 11597,00 28 11626,50

Ch. Freq.

30 11656,00 32 11685,50

Ch. Freq.

65 11720 67 11758 69 11798 71 11837

Ch. Freq.

73 11876 75 11914 77 11954 79 11992

Ch. Freq.

81 12032 83 12070 85 12110 87 12148

Ch. Freq.

89 12188 91 12226 93 12266 95 12304

Ch. Freq.

97 12344 99 12382 101 12422 103 12460

Ch. Freq.

105 12515 107 12545 109 12574 111 12604

Ch. Freq.

113 12633 115 12663 117 12692 119 12722

Ch. Freq.

66 11740 68 11778 70 11817 72 11856

Ch. Freq.

74 11895 76 11934 78 11973 80 12012

Ch. Freq.

82 12051 84 12090 86 12129 88 12168

Ch. Freq.

90 12207 92 12246 94 12285 96 12324

Ch. Freq.

98 12363 100 12402 102 12441 104 12480

Ch. Freq.

106 12522 108 12552 110 12581 112 12610

Ch. Freq.

114 12640 116 12670 118 12699 120 12728

EUT13-HL

Ch. Freq.

111 10722 113 10775 115 10815 117 10853

Ch. Freq.

119 10892 121D 10914 121A 10933 123 10974

Ch. Freq.

125 11009 127 11054 129 11095 131 11148

Ch. Freq.

131b 11178 1D 11205 1A 11224 3 11265

Ch. Freq.

5 11304 7 11348 9D 11371 9A 11389

Ch. Freq.

11D 11413 11A 11431 13 11474 15 11516

Ch. Freq.

153 11566 155 11604 157 11642

EUT13-VL

Ch. Freq.

110 10719 112 10758 114 10796 116 10834 118 10873

Ch. Freq.

120 10911 122 10949 124 10989 126 11033 128 11079

Ch. Freq.

130A 11113 130D 11131 132A 11163 132D 11196 2 11241

Ch. Freq.

4 11280 4b 11283 6A 11321 6D 11339 8 11363

Ch. Freq.

10A 11404 10D 11422 12A 11446 12D 11446,10 14 11492

Ch. Freq.

16 11531 154 11585 156 11623 158 11662

EUT13-HH

Ch. Freq.

159 11681 51 11745 53 11785 55 11823 57 11862

Ch. Freq.

59 11900 61 11938 63 11977 65 12015 67 12053

Ch. Freq.

69 12092 71 12130 73 12168 75 12203 75b 12211

Ch. Freq.

77 12245 79 12284 81 12322 83 12360 85 12399

Ch. Freq.

87 12437 89 12476 91 12539 93 12565 93b 12573

Ch. Freq.

93c 12583 93d 12590 95 12615 97 12654 99 12692

Ch. Freq.

101 12735

EUT13-VH

Ch. Freq.

50 11727 52 11766 54 11804 56 11843

Ch. Freq.

58 11881 60 11919 62 11958 64 11996

Ch. Freq.

66 12034 68 12073 70 12111 72 12149

Ch. Freq.

74 12188 76 12226 78 12265 80 12303

Ch. Freq.

82 12341 84 12380 86 12418 88 12460

Ch. Freq.

90 12520 92 12558 94 12597 96 12634

Ch. Freq.

98 12673 100 12713

Page 54

A CORUÑA

SANTIAGO

VIGO

VALENCIA

OPORTO

LISBOA

MADRID

ZARAGOZA

BILBAO

BARCELONA

MURCIA

MALAGA

SEVILLA

OVIEDO

LUGO

OURENSE

CANTABRIA

GUIPUZCOA

LEON

BURGOS

ALAVA

NAVARRA

LA RIOJA

HUESCA

TARRAGONA

SEGOVIA

GUADALAJARA

AVILA

CUENCA

TOLEDO

CIUDAD REAL

TERUEL

CASTELLON

BADAJOZ

CORDOBA

HUELVA

CADIZ

JAEN

GRANADA

ALMERIA

ALBACETE

ALICANTE

SALAMANCA

PALENCIA

ZAMORA

VALLADOLID

GIRONA

PALMA DE MALLORCA

BALEARES

CANARIAS

TENERIFE

LAS PALMAS

SUCURSALES

DELEGACIONES

FABRICAS

SORIA

CACERES

ZAMORA N

DELEGACIONES

ALMERIA C.P. 04008

Campogrís 9. Tfno. 950 23 14 43 Fax 950 23 14 43 [email protected]

BADAJOZ C.P. 06010 Jacobo Rodriguez Pereira 11 Oficina. Tfno. 924 20 74 83 Fax. 924 20 01 15 [email protected]

BURGOS C.P. 09080 C/ Juan Vazquez 32. Tfno. 947 22 78 47 / 909 41 91 95 Fax 947 21 07 31

CACERES C.P.10005 Residencial San Francisco Blq.1 1ºD. Tfno. 927 23 14 56 / 900 40 25 00 Fax. 927 23 17 29

CORDOBA C.P. 14012 C/Sta. Rafaela Mª del Sagrado Corazon 2. Tfno. 957 27 09 80 / 919 55 55 73 Fax 957 40 30 44

GRANADA C.P. 18008 C/ Alhamí 16. Bajo Tfno. 958 81 22 81 / 908 95 83 32 Fax 958 81 22 81 [email protected]

JAEN C.P. 23007 Hermanos Pinzón 8. Tfno. 953 29 50 40 / 953 29 52 21

639 98 44 89

Fax 953 29 52 10 LA RIOJA C.P. 26004

San Prudencio 19. bajo Tfno. 941 23 35 24 Fax 941 25 50 78

MALAGA C.P.29004 Polígono de Santa Bárbara C/ Fidias 13. Tfno. 95 223 98 81 Fax 95 217 37 30 [email protected]

NAVARRA C.P.(Pamplona) 31007 Avda. Sancho el Fuerte 9. Tfno. 948 27 35 10 Fax 948 17 41 49 [email protected]

OVIEDO C.P.33006 Avda. Buenavista 16. Tfno. 98 524 43 33 Fax 98 524 41 44

GIRONA C.P. 17190 (Salt) Ramón Sambola. 9º Ent. 1ª. Tfno. 972 23 25 43 / 907 23 88 40

PALMA DE MALLORCA C.P. 07007 Ferrer de Pallares 45. bajo D. Tfno. 971 24 70 02 Fax 971 24 53 42

SALAMANCA ZAMORA VALLADOLID C.P. 47008

C/ Arrecife 12. Tfno. 983 22 36 66 Fax 983 22 36 66

HUESCA ZARAGOZA C.P. 50002

C/ Monasterio de Alahón 1-3. Tfno. 976 41 12 73 Fax 976 59 86 86

TELEVES ELECTRONICA PORTUGUESA

MAIA - OPORTO

Via . Dr Francisco Sa Carneiro. Lote 17. ZONA Ind. MAIA 1. Sector-X MAIA. C.P. 4470 BARCA Tfno. 351 2 9418313 Fax 351 2 9488719/9416180 E-mail: [email protected]

LISBOA

C.P. 1000 Rua Augusto Gil 21-A. Tfno. 351 1 7932537 Fax 351 1 7932418 E-mail: [email protected]

TELEVES UNITED KINGDOM LTD

Unit 11 Hill Street, Industrial State CWMBRAN, GWENT NP44 7PG. (United Kingdom) Tfno. 44 01 633 87 58 21 Fax 44 01 633 86 63 11 E-mail: [email protected]

TELEVES FRANCE S.A.R.L.

Parc des Arpents 12 Rue du Pré des Aulnes. 77340 PONTAULT-COMBAULT.(France) Tfno. 33 01 60 18 30 40. Fax 33 01 60 18 30 49. E-mail [email protected]

TELEVES MIDDLE EAST FZE

P.O. Box 17199 JEBEL ALI FREE ZONE DUBAI UNITED ARAB EMIRATES Tel. 971 4834 344 Fax. 971 4834 644 E-mail [email protected]

SUCURSALES

BARCELONA C.P. 08940

C/ Sant Ferrán, 27 Cornellá - Barcelona Telfs. 93 377 08 62 / 93 474 29 50 Fax 93 474 50 06 E-mail [email protected]

BILBAO C.P. 48002 Mendipe 12. Tfnos. 94 421 50 44 / 443 80 66 Fax 94 444 89 92 [email protected]

A CORUÑA C.P. 15011 Gregorio Hernández 8. Tfnos. 981 27 47 31 / 27 22 10 Fax 981 27 16 11 [email protected]

LAS PALMAS C.P. 35006 Gral. Mas de Gaminde 26. Tfnos. 928 23 11 22 / 23 12 42 Fax 928 23 13 66 [email protected]

MADRID C.P. 28005 Paseo de los Pontones 11. Tfnos. 91 474 52 21 / 474 52 22 Fax 91 474 54 21 [email protected]

MURCIA C.P. 30010 Polígono Conver - C/ Rio Pliego 22. Tfnos. 968 26 31 44 / 26 31 77 Fax 968 25 25 76 [email protected]

SEVILLA C.P. 41008 Pol. Ind. Store - C/ A-6. Nave 5 Tfnos. 95 443 64 50 / 443 58 00 Fax 95 443 96 93 [email protected]

TENERIFE C.P. 38108 Avda. El Paso, 25 - Los Majuelos La Laguna. Tfnos. 922 31 13 14 / 31 13 16 Fax 922 31 13 33 [email protected]

VALENCIA C.P. 46021 Avda. del Puerto 21. Tfnos. 96 337 12 01 / 337 12 72 Fax 96 337 06 98 [email protected]

VIGO C.P. 36204 Escultor Gregorio Fernández, 5 Tfnos. 986 42 33 87 / 42 40 44 Fax 986 42 37 94 [email protected]

ER 224/1/94

SEDE CENTRAL

SANTIAGO DE COMPOSTELA C.P. 15706 Rúa B. de Conxo, 17 Tfno. 981 52 22 00 Fax 981 52 22 62 Apartado 444

E-mail: [email protected]

www.televes.com

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